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A Level Physics Practice Test: Electric Current, Potential Difference and Resistance
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Electric current, potential difference, and resistance are related to each other by Ohm's law. Ohm's law states that in any conductor, the flowing electric current is directly proportional to the potential difference between the two ends of the conductor. It can be written as \(I=V/R\) where R is the resistance. Electric current: The flow of electric charges. It is represented by the symbol ampere. Potential difference: Also known as voltage, it is a measure of the energy transferred between two points in a circuit. It is represented by the symbol volt. Resistance: The restriction of the... Show more
A Level Physics Practice Test: Electric Current, Potential Difference and Resistance
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23 Questions

1. Rate of flow of electric charge is
2. Actual velocity of electrons between collisions is
3. Current in a circuit if resistance of 15 Ω and potential difference of 3.0 V is applied across it's ends is
4. Current in a circuit depends on
5. Grid cables are 15 km long with a resistance of 0.20 Ω km-1, powers wasted as heat in these cables are
6. By increasing the current, the drift velocity
7. Number of conduction electrons per unit volume is
8. A straight line symbol shows the
9. Semiconductors have electron number density of order
10. Electric power is related to
11. If a current of 1 A passes through a point in 1 s then charge passes that point is
12. 1 Ω is equal to
13. Number density for copper is
14. To protect wiring from excessive passing of current is
15. Current in a 60 W light bulb when it is connected to a 230 V power supply is
16. instrument which transfers energy to electric charges in a circuit is
17. A voltmeter arranged across the power supply measures
18. If direction of current is from positive to negative, then it is called
19. Electrons which are free to move around are also called
20. Current in a circuit when a charge of 180 C passes a point in a circuit in 2 minutes is
21. Mean drift velocity of electron in a copper wire having cross-sectional area 5.0 × 10-6 m2 carrying current of 1 A and having number density 8.5 × 1028 m3 is
22. Magnitude of charge is known as
23. Energy transferred per unit charge is