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
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Questions on Electricity
Showing 31–60 of 12831.A 2 Ohm resistor carries a current of 3 A. The heat produced in 10 seconds is: 32.Which of the following is an ohmic conductor? 33.If the temperature of a semiconductor increases, its resistance: 34.The direction of electron flow is ___________ to the conventional current. 35.The energy supplied by the cell in moving a unit charge from one end to the other is called its: 36.What is the cause of 'overloading' in domestic circuits? 37.What does a 'short circuit' mean in an electric circuit? 38.The symbol for a variable resistor is: 39.Why are copper wires generally used for electrical transmission? 40.If an electric bulb of 40W, 220V is connected to a 110V supply, the power consumed will be: 41.Which statement is true for voltage in a parallel circuit? 42.Which statement is true for current in a series circuit? 43.A device that changes the resistance in an electric circuit is called a: 44.The material of an electric fuse wire should have: 45.What is the effect of increasing temperature on the resistance of a pure metal conductor? 46.An electric cell converts: 47.Which of the following is true about electric potential? 48.The property of a conductor to resist the flow of current is called: 49.In a parallel circuit containing two resistors, if the current through the first resistor is 2 A and the total current is 5 A, what is the current through the second resistor? 50.A circuit consists of two resistors in series. If the voltage across the first resistor is 5 V and the total voltage is 12 V, what is the voltage across the second resistor? 51.If an electric bulb draws a current of 0.5 A when the voltage is 200 V, its power is: 52.If the reading of an ammeter is 2 A and the resistance is 10 Ohm, what is the voltage across the resistor? 53.A 60 W light bulb is switched on for 2 hours. How much electrical energy is consumed? 54.Which of the following represents electric power? 55.To increase the brightness of a bulb in a circuit, we can: 56.The resistance of an ideal voltmeter is: 57.The resistance of an ideal ammeter is: 58.Why is tungsten used for the filament of incandescent light bulbs? 59.Which material is typically used for heating elements in electric toasters and irons? 60.A component whose resistance changes with voltage is called a: