Electricity is the flow of electric charge that powers devices and makes things work.
Important Parts of Electricity:
- Electric Current: The flow of electric charge, measured in Amps (A).
- Voltage: The force that pushes the electric charge, measured in Volts (V).
- Resistance: The opposition to the flow of current, measured in Ohms (Ω).
- Ohm's Law: V = I × R – Voltage = Current × Resistance.
- Power: The amount of energy used, calculated by P = V × I (measured in Watts).
Types of Current:
- DC (Direct Current): Flows in one direction (like from a battery).
- AC (Alternating Current): Reverses direction (like in home electricity).
Practice Questions PDF
Download a printable worksheet on Electricity with answers.
Questions on Electricity
Showing 61–90 of 12861.A current of 2 A flows through a conductor for 5 minutes. The amount of charge that passes through the conductor is: 62.The amount of current flowing through a circuit is 0.5 A. How much charge passes through a point in the circuit in 10 minutes? 63.If 100 J of work is done to move 4 C of charge from one point to another, the potential difference between the two points is: 64.What is the potential difference required to make 1 A of current flow through a resistance of 1 Ohm? 65.Which of the following is a good conductor of electricity? 66.The 'Ampere' is the unit of: 67.The unit 'Volt' is equivalent to: 68.An electric heater is rated 1500 W, 220 V. The current drawn by it is: 69.Two resistors of 10 Ohm and 20 Ohm are connected in parallel. The equivalent resistance is: 70.Two resistors of 10 Ohm and 20 Ohm are connected in series. The equivalent resistance is: 71.Resistivity of a conductor depends on: 72.The resistance of a conductor is inversely proportional to its: 73.How many electrons constitute one coulomb of charge? 74.What is the charge of an electron? 75.In an electric circuit, the conventional direction of current flow is: 76.A 220 V, 100 W bulb has a resistance of approximately: 77.Which of the following factors does not affect the resistance of a conductor? 78.When the cross-sectional area of a metallic wire is doubled, its resistance will: 79.When the length of a metallic wire is doubled, its resistance will: 80.If a wire of resistance R is cut into two equal halves, the resistance of each half will be: 81.Why are domestic electrical appliances usually connected in parallel? 82.The material used for the filament of an electric bulb is usually: 83.An electric fuse is used as a safety device in circuits to: 84.1 kilowatt-hour is equivalent to: 85.The commercial unit of electrical energy is: 86.The SI unit of electric power is: 87.The rate at which electrical energy is consumed or dissipated in an electric circuit is called: 88.Which of the following is an application of the heating effect of electric current? 89.The heating effect of electric current is given by: 90.When resistors are connected in parallel, the reciprocal of the total resistance is equal to: