General Science – Electricity One-Liner Revision Notes for JKSSB Exams

Electricity is one of the most important topics in the General Science section of JKSSB examinations, including Finance Accounts Assistant (FAA), Junior Assistant (JA), Panchayat Secretary, Patwari, and various other recruitment exams. Questions are frequently asked from basic concepts such as electric current, voltage, resistance, Ohm’s Law, electrical power, domestic wiring, and safety devices.

For competitive examinations, candidates are not expected to perform complex calculations. Instead, most questions test conceptual understanding, definitions, SI units, scientific laws, and practical applications of electricity in daily life. Therefore, quick revision of important facts can significantly improve your score in the General Science section.

This article provides concise and exam-oriented one-liner notes covering all major electricity concepts prescribed in the JKSSB syllabus. These notes are designed for rapid revision before the examination and will help you recall important facts, formulas, units, and scientific principles commonly asked in objective-type questions.

Let us begin with the fundamental concepts of electricity.

Basic Concepts of Electricity – One-Liner Notes

• Electricity is the flow of electric charges through a conductor.
• Electric charge is the fundamental property of matter responsible for electrical phenomena.
• The SI unit of electric charge is Coulomb (C).
• An electron carries a negative charge.
• A proton carries a positive charge.
• The charge on one electron is 1.6 × 10⁻¹⁹ Coulomb.
• Like charges repel each other, while unlike charges attract each other.
• The accumulation of electric charges on an object is called static electricity.
• The continuous flow of electric charges is called current electricity.
• Materials that allow electric current to pass through them easily are called conductors.
• Copper, silver, and aluminum are good conductors of electricity.
• Materials that do not allow electric current to pass through them are called insulators.
• Rubber, plastic, glass, and wood are common insulators.
• The movement of electrons in a conductor produces electric current.
• Metals conduct electricity because they contain free electrons.
• The flow of current requires a closed conducting path called an electric circuit.
• A broken circuit does not allow electric current to flow.
• The device used to provide electrical energy in a circuit is called a cell or battery.
• The positive terminal of a cell is represented by a longer line in circuit diagrams.
• Electric current flows from higher potential to lower potential in a circuit.
• Lightning is a natural example of static electricity.
• Benjamin Franklin is known for his experiments on electricity.
• The branch of science dealing with electric charges and their effects is called Electrostatics.
• Electricity has become an essential source of energy in modern life.

Electric Current and Its SI Unit – One-Liner Notes

• Electric current is the rate of flow of electric charge through a conductor.
• The SI unit of electric current is Ampere (A).
• One ampere is equal to the flow of one coulomb of charge per second.
• The formula for electric current is I = Q/t.
• Here, I represents current, Q represents charge, and t represents time.
• Electric current is a scalar quantity.
• The instrument used to measure electric current is called an Ammeter.
• An ammeter is always connected in series with the circuit.
• The symbol of electric current is I.
• The conventional direction of current is from the positive terminal to the negative terminal.
• The actual flow of electrons is from the negative terminal to the positive terminal.
• Current can flow only in a closed circuit.
• Greater charge flow per second means greater current.
• Current in household circuits is measured in amperes.
• Small electric currents are often measured in milliamperes (mA).
• One ampere equals 1000 milliamperes.
• Direct Current (DC) flows in only one direction.
• Cells and batteries supply Direct Current (DC).
• Alternating Current (AC) changes its direction periodically.
• Household electricity is supplied as Alternating Current (AC).
• In India, the frequency of AC supply is 50 Hertz (Hz).
• Electric shock occurs when current passes through the human body.
• The heating effect of current increases with the amount of current flowing through a conductor.
• Higher current generally requires thicker conducting wires.
• Electric current is one of the most frequently asked concepts in JKSSB General Science examinations.

Voltage, Potential Difference and Electromotive Force (EMF) – One-Liner Notes

• Voltage is another name for potential difference.
• Potential difference is the work done in moving a unit positive charge from one point to another.
• The SI unit of potential difference is Volt (V).
• One volt is equal to one joule of work done per coulomb of charge.
• The formula for potential difference is V = W/Q.
• Here, V represents voltage, W represents work done, and Q represents charge.
• Potential difference causes electric current to flow in a circuit.
• Greater potential difference generally produces greater current.
• The instrument used to measure potential difference is called a Voltmeter.
• A voltmeter is always connected in parallel across a component.
• The symbol of potential difference is V.
• A cell creates a potential difference between its terminals.
• The positive terminal of a cell is at a higher potential than the negative terminal.
• Electric current flows from higher potential to lower potential.
• Without potential difference, electric current cannot flow.
• Electromotive Force (EMF) is the energy supplied by a source per unit charge.
• The SI unit of EMF is also Volt (V).
• EMF is represented by the symbol E.
• EMF is produced by cells, batteries, generators, and solar cells.
• The EMF of a source is measured when no current is drawn from it.
• A dry cell generally has an EMF of about 1.5 volts.
• Multiple cells connected in series increase the total voltage.
• Household electricity in India is supplied at approximately 230 volts.
• High-voltage transmission reduces power loss during electricity transmission.
• Questions on voltmeter, volt, EMF, and potential difference are frequently asked in JKSSB examinations.

Resistance and Resistivity – Important One-Liner Notes

• Resistance is the property of a conductor that opposes the flow of electric current.
• The SI unit of resistance is Ohm (Ω).
• Resistance is represented by the symbol R.
• A conductor with high resistance allows less current to flow.
• A conductor with low resistance allows more current to flow.
• The resistance of a wire depends on its length, cross-sectional area, material, and temperature.
• Resistance increases with an increase in the length of the conductor.
• Resistance decreases with an increase in the cross-sectional area of the conductor.
• Thin wires have higher resistance than thick wires of the same material and length.
• Copper and silver have very low resistance and are good conductors.
• Nichrome has high resistance and is commonly used in heating elements.
• The relationship between resistance and dimensions of a conductor is given by:
  R = ρL/A
• Here, ρ (rho) represents resistivity, L is the length, and A is the cross-sectional area.
• Resistivity is the intrinsic property of a material that determines how strongly it opposes electric current.
• The SI unit of resistivity is Ohm-metre (Ω m).
• Resistivity depends only on the nature of the material and temperature.
• Resistivity does not depend on the size or shape of the conductor.
• Materials with low resistivity are good conductors.
• Materials with high resistivity are poor conductors or insulators.
• Rubber, glass, and plastic have very high resistivity.
• Metals generally have low resistivity.
• Resistance of metallic conductors increases with temperature.
• Resistance of semiconductors decreases with temperature.
• A resistor is an electrical component used to provide resistance in a circuit.
• The combination of resistors is commonly used to control current and voltage in electrical circuits.
• Questions on resistance, resistivity, and their units are commonly asked in JKSSB General Science examinations.

Ohm’s Law – Quick Revision Notes

• Ohm’s Law was proposed by the German physicist Georg Simon Ohm.
• Ohm’s Law states that the current flowing through a conductor is directly proportional to the potential difference across it, provided the temperature remains constant.
• The mathematical form of Ohm’s Law is:
  V = IR
• Here, V = Potential Difference (Voltage), I = Current, and R = Resistance.
• Current is directly proportional to voltage.
• Current is inversely proportional to resistance.
• If voltage increases, current also increases (for constant resistance).
• If resistance increases, current decreases (for constant voltage).
• The SI unit of voltage is Volt (V).
• The SI unit of current is Ampere (A).
• The SI unit of resistance is Ohm (Ω).
• One ohm is the resistance of a conductor when a potential difference of one volt produces a current of one ampere.
• Ohm’s Law is valid only when physical conditions such as temperature remain constant.
• The V-I graph for an ohmic conductor is a straight line passing through the origin.
• The slope of the V-I graph gives the value of resistance.
• Conductors that obey Ohm’s Law are called Ohmic conductors.
• Examples of ohmic conductors include metallic wires under constant temperature conditions.
• Devices such as diodes and transistors do not strictly obey Ohm’s Law.
• Ohm’s Law forms the basis of electrical circuit calculations.
• Electricians and engineers use Ohm’s Law to determine current, voltage, and resistance in circuits.
• The formula can be rearranged as:
  • I = V/R
  • R = V/I
• Questions based on Ohm’s Law are among the most frequently asked electricity topics in JKSSB examinations.
• Remember the triangle trick:
  V
  I × R
• Ohm’s Law is considered one of the fundamental laws of electricity.

Electrical Power and Energy – One-Liner Notes

• Electrical Power is the rate at which electrical energy is consumed or converted into other forms of energy.
• The SI unit of electrical power is Watt (W).
• Power is represented by the symbol P.
• One watt is equal to one joule of energy consumed per second.
• The formula for electrical power is:
  P = VI
• Here, P = Power, V = Voltage, and I = Current.
• Other important formulas for power are:
  • P = I²R
  • P = V²/R
• The SI unit of electrical energy is Joule (J).
• Electrical energy is the total work done by an electric current.
• The formula for electrical energy is:
  Electrical Energy = Power × Time
• One kilowatt (kW) equals 1000 watts.
• One megawatt (MW) equals 1000 kilowatts.
• The commercial unit of electrical energy is Kilowatt-hour (kWh).
• One kilowatt-hour is commonly called one unit of electricity.
• One kWh = 3.6 × 10⁶ joules.
• Electricity bills are calculated in units (kWh).
• A 100-watt bulb consumes 100 joules of energy every second.
• A higher power rating means higher energy consumption.
• Electric heaters generally consume more power than electric fans.
• The power rating of electrical appliances is printed on their labels.
• An electric iron typically operates between 750 W and 1500 W.
• Household appliances are selected according to their power requirements.
• Energy-efficient appliances consume less electrical energy.
• LED bulbs consume less power than incandescent bulbs.
• The watt-hour meter measures electrical energy consumption in homes.
• Questions on watt, kilowatt, kilowatt-hour, and power formulas are frequently asked in JKSSB examinations.
• Remember: Power tells how fast energy is used, while energy tells how much electricity is consumed.

Series and Parallel Circuits – Key One-Liner Notes

• An electric circuit is a closed path through which electric current flows.
• Electrical components can be connected in series or parallel.

Series Circuit

• In a series circuit, components are connected one after another in a single path.
• Electric current has only one path to follow in a series circuit.
• The same current flows through all components in a series connection.
• The total resistance in a series circuit is equal to the sum of individual resistances.
  R = R₁ + R₂ + R₃ + …
• The total resistance of a series circuit is always greater than any individual resistance.
• The voltage is divided among different components in a series circuit.
• If one component fails, the entire series circuit stops working.
• Old decorative light strings often used series connections.
• Series circuits are simple to design and construct.

Parallel Circuit

• In a parallel circuit, components are connected across the same two points.
• Electric current has multiple paths to flow in a parallel circuit.
• The potential difference across each branch remains the same.
• The total current is equal to the sum of currents in all branches.
  I = I₁ + I₂ + I₃ + …
• The equivalent resistance of a parallel circuit is less than the smallest individual resistance.
• If one branch fails, the other branches continue to work.
• Household electrical wiring is connected in parallel.
• Parallel circuits provide the same voltage to all appliances.
• Appliances in homes can be switched on and off independently because of parallel connections.
• Parallel circuits are more reliable than series circuits.

Quick Revision Facts

• Same current throughout → Series Circuit
• Same voltage throughout → Parallel Circuit
• One path for current → Series Circuit
• Multiple paths for current → Parallel Circuit
• Failure of one component affects all → Series Circuit
• Failure of one component does not affect others → Parallel Circuit
• Domestic wiring uses → Parallel Circuit
• Total resistance increases → Series Circuit
• Total resistance decreases → Parallel Circuit

Exam Tip

• Questions on domestic wiring, current distribution, voltage distribution, and equivalent resistance are commonly asked in JKSSB General Science examinations.

Heating Effect of Electric Current – One-Liner Notes

• When electric current flows through a conductor, heat is produced. This phenomenon is called the heating effect of electric current.
• The heating effect occurs because electrical energy is converted into heat energy.
• The amount of heat produced depends on the current, resistance, and time of flow.
• Joule’s Law of Heating states that the heat produced in a conductor is directly proportional to:
  • The square of the current (I²)
  • The resistance (R)
  • The time (t)
• The mathematical expression of Joule’s Law is:
  H = I²Rt
• Here, H = Heat energy, I = Current, R = Resistance, and t = Time.
• Greater current produces more heat.
• Higher resistance results in greater heat production.
• Longer duration of current flow increases the amount of heat generated.
• The SI unit of heat energy is Joule (J).
• The heating effect is useful in many electrical appliances.

Appliances Based on Heating Effect

• Electric iron converts electrical energy into heat energy.
• Electric heater uses the heating effect to produce warmth.
• Electric kettle uses heat to boil water.
• Toaster uses heat to toast bread.
• Geyser uses the heating effect to heat water.
• Room heaters work on the principle of Joule heating.

Heating Element

• Nichrome is commonly used as a heating element.
• Nichrome has high resistance and a high melting point.
• It can withstand high temperatures without melting.

Electric Fuse

• A fuse is a safety device used to protect electrical circuits.
• A fuse wire has a low melting point.
• When excessive current flows, the fuse wire melts and breaks the circuit.
• The fuse is always connected in the live wire.
• A fuse protects appliances from short circuits and overloads.

Quick Revision Facts

• Heating effect discovered by → James Prescott Joule
• Heating law → Joule’s Law of Heating
• Formula → H = I²Rt
• Heating element material → Nichrome
• Safety device based on heating effect → Fuse
• SI unit of heat → Joule
• Electrical energy converts into → Heat Energy

Exam Tip

• Questions related to Joule’s Law, fuse, nichrome wire, and household heating appliances are frequently asked in JKSSB examinations.

Magnetic Effect of Electric Current – One-Liner Notes

• When electric current flows through a conductor, it produces a magnetic field around it.
• This phenomenon is known as the magnetic effect of electric current.
• The magnetic effect of current was discovered by Hans Christian Oersted in 1820.
• A current-carrying conductor behaves like a magnet.
• The magnetic field around a straight conductor consists of concentric circular lines.
• The direction of the magnetic field can be determined by the Right-Hand Thumb Rule.
• According to the Right-Hand Thumb Rule, if the thumb points in the direction of current, the curled fingers indicate the direction of the magnetic field.
• The strength of the magnetic field increases with an increase in current.
• The magnetic field becomes stronger near the conductor.

Electromagnet

• An electromagnet is a temporary magnet produced by passing electric current through a coil.
• A soft iron core is commonly used to make a strong electromagnet.
• An electromagnet loses its magnetism when the current is switched off.
• The strength of an electromagnet can be increased by:
  • Increasing the number of turns in the coil.
  • Increasing the current through the coil.
  • Using a soft iron core.

Solenoid

• A solenoid is a long cylindrical coil of insulated wire.
• When current passes through a solenoid, it behaves like a bar magnet.
• The magnetic field inside a solenoid is strong and nearly uniform.
• Solenoids are used in electric bells, relays, and electromagnetic devices.

Electric Bell

• An electric bell works on the principle of an electromagnet.
• When current flows, the electromagnet attracts the iron armature.
• The repeated making and breaking of the circuit produces the ringing sound.

Electric Motor

• An electric motor converts electrical energy into mechanical energy.
• Electric motors work on the magnetic effect of electric current.
• Electric fans, mixers, pumps, and washing machines use electric motors.
• The inventor of the practical electric motor is Michael Faraday.

Quick Revision Facts

• Discovery of magnetic effect → Hans Christian Oersted
• Rule for magnetic field direction → Right-Hand Thumb Rule
• Temporary magnet → Electromagnet
• Coil used to produce a magnetic field → Solenoid
• Device based on electromagnet → Electric Bell
• Electrical energy to mechanical energy → Electric Motor
• Soft iron is used in → Electromagnets

Domestic Electricity and Safety Devices – One-Liner Notes

• Electricity supplied to homes is known as domestic electricity.
• Household electricity in India is generally supplied at 230 volts and 50 Hz frequency.
• Domestic electrical wiring is connected in parallel.
• Parallel wiring ensures that all appliances receive the same voltage.
• Appliances can operate independently in a parallel circuit.

Types of Wires in Domestic Wiring

• A standard domestic circuit contains Live Wire, Neutral Wire, and Earth Wire.
• The Live Wire carries current from the power source to the appliance.
• The live wire is usually red or brown in color.
• The Neutral Wire carries current back to the source.
• The neutral wire is usually black or blue in color.
• The Earth Wire is a safety wire connected to the ground.
• The earth wire is usually green or green-yellow in color.
• The earth wire prevents electric shock by providing a low-resistance path to the ground.

Electric Fuse

• A fuse is a safety device used to protect electrical circuits from excessive current.
• Fuse wire has a low melting point.
• When excess current flows, the fuse melts and breaks the circuit.
• The fuse is connected in the live wire.
• A fuse protects against overloads and short circuits.

Miniature Circuit Breaker (MCB)

• MCB stands for Miniature Circuit Breaker.
• An MCB automatically switches off the circuit during overload or short circuit conditions.
• MCBs are safer and more reliable than traditional fuses.
• Unlike a fuse, an MCB can be reset after tripping.

Earthing

• Earthing is the process of connecting the metallic body of an appliance to the earth.
• Earthing protects users from electric shocks.
• Appliances such as refrigerators, washing machines, and geysers require proper earthing.
• The earth wire is generally connected to a metal plate buried deep in the ground.

Short Circuit and Overloading

• A short circuit occurs when live and neutral wires come into direct contact.
• A short circuit causes a sudden increase in current.
• Overloading occurs when too many appliances are connected to the same circuit.
• Both short circuits and overloading can lead to overheating and fire hazards.

Quick Revision Facts

• Domestic supply in India → 230 V, 50 Hz
• Wiring used in homes → Parallel Wiring
• Safety wire → Earth Wire
• Safety device with low melting point → Fuse
• Modern safety device → MCB
• Protection against electric shock → Earthing
• Direct contact between live and neutral wires → Short Circuit
• Too many appliances on one circuit → Overloading

Exam Tip

• Questions on live wire, neutral wire, earth wire, fuse, MCB, earthing, short circuit, and domestic wiring are frequently asked in JKSSB General Science examinations.

Common Electrical Devices and Their Uses – One-Liner Notes

• Electrical devices convert electrical energy into various useful forms such as heat, light, sound, or mechanical energy.

Electric Generator

• An electric generator converts mechanical energy into electrical energy.
• A generator works on the principle of electromagnetic induction.
• The principle of electromagnetic induction was discovered by Michael Faraday.
• Power stations use large generators to produce electricity.
• Generators are used as backup power sources during power failures.

Electric Motor

• An electric motor converts electrical energy into mechanical energy.
• Electric motors work on the magnetic effect of electric current.
• Electric fans, mixers, water pumps, and washing machines use electric motors.

Transformer

• A transformer is a device used to increase or decrease alternating voltage.
• A transformer works only on Alternating Current (AC).
• A Step-Up Transformer increases voltage.
• A Step-Down Transformer decreases voltage.
• Transformers operate on the principle of mutual induction.
• Transformers are widely used in power transmission systems.

Battery

• A battery is a combination of two or more electric cells.
• A battery converts chemical energy into electrical energy.
• Batteries are used in mobile phones, vehicles, UPS systems, and flashlights.
• Dry cells and rechargeable cells are common types of batteries.

Dynamo

• A dynamo is a small generator that produces electricity.
• Dynamos convert mechanical energy into electrical energy.
• Bicycle lights traditionally use dynamos.

Inverter

• An inverter converts Direct Current (DC) into Alternating Current (AC).
• Inverters provide backup electricity during power cuts.
• Household inverters use batteries as a source of stored energy.

LED Bulb

• LED stands for Light Emitting Diode.
• LED bulbs consume less electricity than traditional bulbs.
• LEDs have a longer lifespan and higher efficiency.
• LED bulbs are widely used for energy conservation.

Electric Bell

• An electric bell works on the principle of an electromagnet.
• It converts electrical energy into sound energy.

Quick Revision Facts

• Mechanical energy → Electrical energy → Generator
• Electrical energy → Mechanical energy → Motor
• Increases voltage → Step-Up Transformer
• Decreases voltage → Step-Down Transformer
• Chemical energy → Electrical energy → Battery
• DC to AC conversion → Inverter
• Energy-efficient lighting device → LED Bulb
• Electromagnetic induction discovered by → Michael Faraday
• Electric bell works on → Electromagnetism

Most Important JKSSB Exam One-Liners (Top 50 Electricity Facts)

1. The SI unit of electric charge is Coulomb (C).
2. The SI unit of electric current is Ampere (A).
3. The SI unit of potential difference is Volt (V).
4. The SI unit of resistance is Ohm (Ω).
5. The SI unit of electrical power is Watt (W).
6. The SI unit of electrical energy is Joule (J).
7. Electric current is measured using an Ammeter.
8. Potential difference is measured using a Voltmeter.
9. Resistance is measured using an Ohmmeter.
10. Current is the rate of flow of electric charge.
11. An electron carries a negative charge.
12. A proton carries a positive charge.
13. Like charges repel each other.
14. Unlike charges attract each other.
15. Copper is a good conductor of electricity.
16. Rubber is a good insulator of electricity.
17. The conventional direction of current is from positive to negative terminal.
18. The actual flow of electrons is from negative to positive terminal.
19. Ohm’s Law was given by Georg Simon Ohm.
20. Ohm’s Law formula is V = IR.
21. One ampere equals one coulomb per second.
22. One kilowatt equals 1000 watts.
23. One unit of electricity equals one kilowatt-hour (kWh).
24. One kWh equals 3.6 × 10⁶ joules.
25. The heating effect of current was studied by James Prescott Joule.
26. Joule’s Law of Heating is H = I²Rt.
27. Nichrome is used as a heating element.
28. Fuse wire has a low melting point.
29. A fuse is connected in the live wire.
30. MCB stands for Miniature Circuit Breaker.
31. Earthing protects against electric shock.
32. Household wiring is connected in parallel.
33. Domestic electricity in India is supplied at 230 V.
34. The frequency of AC supply in India is 50 Hz.
35. AC stands for Alternating Current.
36. DC stands for Direct Current.
37. A battery converts chemical energy into electrical energy.
38. A generator converts mechanical energy into electrical energy.
39. A motor converts electrical energy into mechanical energy.
40. A transformer works only with AC.
41. A step-up transformer increases voltage.
42. A step-down transformer decreases voltage.
43. The magnetic effect of current was discovered by Hans Christian Oersted.
44. An electromagnet loses magnetism when current is switched off.
45. A solenoid behaves like a bar magnet.
46. An electric bell works on the principle of an electromagnet.
47. Electromagnetic induction was discovered by Michael Faraday.
48. LED stands for Light Emitting Diode.
49. Lightning is an example of static electricity.
50. Domestic appliances are connected in parallel to ensure independent operation.

Last-Minute Revision Formula Box

• Current: I = Q/t
• Potential Difference: V = W/Q
• Ohm’s Law: V = IR
• Power: P = VI
• Power: P = I²R
• Power: P = V²/R
• Heat Produced: H = I²Rt
• Resistance: R = ρL/A

Frequently Asked JKSSB MCQ Facts from Electricity

Important Exam-Oriented Facts

• The SI unit of electric current is Ampere.
• The SI unit of resistance is Ohm.
• The SI unit of power is Watt.
• The commercial unit of electrical energy is Kilowatt-hour (kWh).
• One unit of electricity is equal to 1 kWh.
• The device used to measure electric current is an Ammeter.
• The device used to measure voltage is a Voltmeter.
• A fuse wire is made of a material with a low melting point.
• Nichrome is commonly used in heating elements due to its high resistance.
• Household electrical wiring is connected in parallel.
• The frequency of AC supply in India is 50 Hz.
• Domestic electricity is supplied at approximately 230 V.
• A transformer works only with Alternating Current (AC).
• A generator converts mechanical energy into electrical energy.
• A motor converts electrical energy into mechanical energy.
• A battery converts chemical energy into electrical energy.
• Earthing protects users from electric shock.
• MCB stands for Miniature Circuit Breaker.
• An electric bell works on the principle of an electromagnet.
• A solenoid acts like a bar magnet when current flows through it.

Frequently Confused Facts

Scientists and Discoveries

• Georg Simon Ohm → Ohm’s Law
• James Prescott Joule → Joule’s Law of Heating
• Hans Christian Oersted → Magnetic Effect of Electric Current
• Michael Faraday → Electromagnetic Induction
• Benjamin Franklin → Early Experiments on Electricity

Quick Memory Tricks

• Ammeter = Ampere = Current
• Voltmeter = Volt = Voltage
• Ohmmeter = Ohm = Resistance
• MCB = Modern Circuit Breaker
• LED = Light Emitting Diode
• AC = Alternating Current
• DC = Direct Current

High-Probability Questions for JKSSB

1. Which device measures electric current?
2. What is the SI unit of resistance?
3. Who discovered the magnetic effect of electric current?
4. What is the commercial unit of electrical energy?
5. Which material is used in heating elements?
6. Why is domestic wiring connected in parallel?
7. What is the function of an earth wire?
8. What is the frequency of AC supply in India?
9. Which device converts electrical energy into mechanical energy?
10. What is the formula for electrical power?

These facts are repeatedly tested in JKSSB, SSC, Railway, Banking, and other competitive examinations. A quick revision of this section before the exam can help secure easy marks from the General Science portion.

Conclusion

Electricity is one of the most important and frequently asked topics in the General Science section of JKSSB examinations. Most questions are straightforward and focus on basic concepts, SI units, scientific laws, electrical devices, domestic wiring, safety measures, and everyday applications of electricity. Therefore, a clear understanding of fundamental concepts can help candidates score easy marks in the exam.

The one-liner notes provided in this article are designed for quick revision and last-minute preparation. By regularly revising important formulas, units, inventors, and key facts, aspirants can improve both speed and accuracy while solving objective-type questions. Focus on understanding the concepts behind the facts, practice previous years’ questions, and use these notes as a handy revision guide before the examination.

Consistent revision of these Electricity notes will strengthen your General Science preparation and increase your chances of performing well in JKSSB Finance Accounts Assistant and other JKSSB recruitment examinations.

Frequently Asked Questions (FAQs)

1. What is the SI unit of electric current?

The SI unit of electric current is Ampere (A).

2. Who gave Ohm’s Law?

Georg Simon Ohm gave Ohm’s Law, which states that current is directly proportional to voltage when temperature remains constant.

3. What is the formula of Ohm’s Law?

The formula of Ohm’s Law is: V = IR

where V = Voltage, I = Current, and R = Resistance.

4. What is the commercial unit of electrical energy?

The commercial unit of electrical energy is Kilowatt-hour (kWh), commonly known as one unit of electricity.

5. What is the difference between AC and DC?

• AC (Alternating Current) changes direction periodically.
• DC (Direct Current) flows only in one direction.

6. Why is household wiring connected in parallel?

Household wiring is connected in parallel so that all appliances receive the same voltage and can operate independently.

7. What is the function of a fuse?

A fuse protects electrical circuits and appliances from excessive current caused by overloading or short circuits.

8. What is an MCB?

MCB (Miniature Circuit Breaker) is a safety device that automatically switches off the circuit when excess current flows.

9. Which material is commonly used as a heating element?

Nichrome is commonly used as a heating element because of its high resistance and high melting point.

10. Who discovered the magnetic effect of electric current?

The magnetic effect of electric current was discovered by Hans Christian Oersted in 1820.

11. What is the function of an earth wire?

An earth wire protects users from electric shock by providing a low-resistance path for leakage current to flow into the ground.

12. Which device converts electrical energy into mechanical energy?

An electric motor converts electrical energy into mechanical energy.

13. Which device converts mechanical energy into electrical energy?

An electric generator converts mechanical energy into electrical energy.

14. What is the standard domestic voltage supply in India?

The standard domestic voltage supply in India is approximately 230 volts.

15. Why is Electricity important for JKSSB Exams?

Electricity is a frequently asked topic in JKSSB General Science. Questions are commonly asked on SI units, Ohm’s Law, electrical devices, safety measures, domestic wiring, and scientific discoveries.

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Rohit Thapa

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