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Current electricity

Written by Dr. Hamza Farooq (Physics)

Class 10 · Physics · 10 questions

Name: ____________________   Date: ____________

  1. The SI unit of electric current is the:

    • A Volt
    • B Watt
    • C Ohm
    • D Ampere

  2. Ohm's law states that V is equal to:

    • A I + R
    • B I x R
    • C R / I
    • D I / R

  3. A 12 V battery drives a current of 3 A through a resistor. What is its resistance?

    • A 4 ohm
    • B 36 ohm
    • C 0.25 ohm
    • D 9 ohm

  4. Two 6 ohm resistors are connected in parallel. Their combined resistance is:

    • A 36 ohm
    • B 3 ohm
    • C 6 ohm
    • D 12 ohm

  5. A 100 W bulb runs for 10 hours. How many kilowatt hours of energy does it use?

    • A 100 kWh
    • B 0.1 kWh
    • C 1 kWh
    • D 10 kWh

  6. Which device is connected in series in a circuit to measure current?

    • A Voltmeter
    • B Galvanometer in parallel
    • C Rheostat
    • D Ammeter

  7. The resistance of a wire increases when its length:

    • A Stays the same
    • B Decreases
    • C Becomes zero
    • D Increases

  8. A fuse in a circuit is used to:

    • A Store charge
    • B Increase current
    • C Protect against too much current
    • D Measure voltage

  9. In a series circuit the current is:

    • A Zero
    • B Different in each part
    • C The same everywhere
    • D Infinite

  10. The potential difference across 2 ohm carrying 3 A is:

    • A 1.5 V
    • B 5 V
    • C 6 V
    • D 0.67 V

Answer key

1. D, 2. B, 3. A, 4. B, 5. C, 6. D, 7. D, 8. C, 9. C, 10. C

  1. Current is measured in amperes.

  2. V = I R at constant temperature.

  3. R = V / I = 12 / 3 = 4 ohm.

  4. 1/R = 1/6 + 1/6 = 1/3, so R = 3 ohm.

  5. Energy = 0.1 kW x 10 h = 1 kWh.

  6. An ammeter is placed in series so that the current flows through it.

  7. R is proportional to length.

  8. A fuse melts if the current is too high.

  9. There is only one path for the current.

  10. V = I R = 6 V.