JAMB and WAEC Physics questions: Current electricity

34 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Current electricity· WAEC

   Three 6 Ω resistors are connected in parallel. The effective resistance is

   • A3 Ω
   • B18 Ω
   • C6 Ω
   • D2 Ω

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   Explanation and discussion

2. Question 2· Current electricity· JAMB

   

   In the circuit shown, the battery has negligible internal resistance. Find the current drawn from the battery.

   • A1 A
   • B1.2 A
   • C6 A
   • D3 A

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   Explanation and discussion

3. Question 3· Current electricity· WAEC

   A current of 0.5 A flows for 2 minutes. How much charge passes?

   • A30 C
   • B1 C
   • C240 C
   • D60 C

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   Explanation and discussion

4. Question 4· Current electricity· JAMB

   

   In the circuit shown, the cell has negligible internal resistance. Find the effective resistance of the three resistors.

   • A0.67 Ω
   • B15 Ω
   • C2.0 Ω
   • D1.5 Ω

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   Explanation and discussion

5. Question 5· Current electricity· WAEC

   Resistors of 4 Ω, 6 Ω and 10 Ω are connected in series. Find their total resistance.

   • A10 Ω
   • B1.9 Ω
   • C240 Ω
   • D20 Ω

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   Explanation and discussion

6. Question 6· Current electricity· JAMB

   

   In the circuit shown, the cell has negligible internal resistance. Find the current through the 3 Ω resistor.

   • A0.5 A
   • B1.0 A
   • C2.0 A
   • D3.0 A

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   Explanation and discussion

7. Question 7· Current electricity· JAMB

   A wire has a resistance of 10 Ω. Another wire of the same material, twice as long and with twice the cross-sectional area, has a resistance of

   • A10 Ω
   • B20 Ω
   • C40 Ω
   • D5 Ω

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   Explanation and discussion

8. Question 8· Current electricity· WAEC

   Resistors of 2 Ω, 3 Ω and 5 Ω are connected in series. Their total resistance is

   • A10 Ω
   • B1 Ω
   • C30 Ω
   • D0.97 Ω

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   Explanation and discussion

9. Question 9· Current electricity· JAMB

   A resistor of 5 Ω carries a current of 2 A. The potential difference across it is:

   • A2.5 V
   • B7 V
   • C10 V
   • D0.4 V

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   Explanation and discussion

10. Question 10· Current electricity· WAEC

    An ammeter is connected in a circuit

    • Aacross the cell
    • Bin parallel
    • Cin series
    • Dacross the resistor

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    Explanation and discussion

11. Question 11· Current electricity· JAMB

    In a circuit, an ammeter is connected

    • Ain series, like a voltmeter
    • Bin parallel, and a voltmeter in series
    • Cin parallel, like a voltmeter
    • Din series, and a voltmeter in parallel

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    Explanation and discussion

12. Question 12· Current electricity· JAMB

    A charge of 60 C passes a point in a circuit in 2 minutes. The current is:

    • A30 A
    • B0.5 A
    • C120 A
    • D2 A

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    Explanation and discussion

13. Question 13· Current electricity· JAMB

    

    In the circuit shown, the battery has negligible internal resistance. Find the current through the 6 Ω resistor.

    • A3 A
    • B2 A
    • C1 A
    • D0.5 A

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    Explanation and discussion

14. Question 14· Current electricity· JAMB

    Three resistors of 6 Ω each are connected in parallel. Their effective resistance is:

    • A18 Ω
    • B3 Ω
    • C2 Ω
    • D0.5 Ω

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    Explanation and discussion

15. Question 15· Current electricity· JAMB

    A Wheatstone bridge balances with P = 4 Ω, Q = 6 Ω and R = 10 Ω. Find the unknown resistance S.

    • A2.4 Ω
    • B6.7 Ω
    • C15 Ω
    • D20 Ω

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    Explanation and discussion

16. Question 16· Current electricity· JAMB

    

    In the circuit shown, the cell has negligible internal resistance. Find the total current drawn from the cell.

    • A2.0 A
    • B1.0 A
    • C0.2 A
    • D4.5 A

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    Explanation and discussion

17. Question 17· Current electricity· WAEC

    A current of 2 A flows through a resistor of 6 Ω. The potential difference across it is

    • A3 V
    • B12 V
    • C8 V
    • D4 V

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    Explanation and discussion

18. Question 18· Current electricity· WAEC

    Two resistors of 4 Ω and 12 Ω are connected in parallel. Their combined resistance is

    • A3 Ω
    • B16 Ω
    • C8 Ω
    • D0.33 Ω

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    Explanation and discussion

19. Question 19· Current electricity· WAEC

    A wire of resistance 10 Ω carries 2 A. The p.d. across it is

    • A0.2 V
    • B5 V
    • C12 V
    • D20 V

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    Explanation and discussion

20. Question 20· Current electricity· WAEC

    A galvanometer is converted to an ammeter by connecting

    • Aa low resistance in parallel (a shunt)
    • Ba high resistance in series
    • Ca capacitor
    • Da diode

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    Explanation and discussion