WAEC Physics questions: Current electricity

15 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· 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

3. Question 3· 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

4. Question 4· 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

5. Question 5· 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

6. Question 6· 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

7. Question 7· 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

8. Question 8· 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

9. Question 9· 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

10. Question 10· Current electricity· WAEC

    Ohm's law applies to a metallic conductor provided its

    • Atemperature stays constant
    • Blength changes
    • Ccurrent is a.c.
    • Dcolour is the same

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    Explanation and discussion

11. Question 11· Current electricity· WAEC

    A potentiometer is preferred to a voltmeter for measuring e.m.f. because it

    • Ais smaller
    • Bis cheaper
    • Cdraws no current at balance
    • Dhas a scale

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    Explanation and discussion

12. Question 12· Current electricity· WAEC

    A wire of resistance 8 Ω is cut into two equal halves, which are then joined in parallel. Find the new resistance.

    • A8 Ω
    • B4 Ω
    • C16 Ω
    • D2 Ω

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    Explanation and discussion

13. Question 13· Current electricity· WAEC

    Find the combined resistance of 4 Ω and 12 Ω resistors connected in parallel.

    • A16 Ω
    • B3 Ω
    • C8 Ω
    • D48 Ω

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    Explanation and discussion

14. Question 14· Current electricity· WAEC

    What current flows through a 20 Ω resistor when the p.d. across it is 6 V?

    • A120 A
    • B0.3 A
    • C3.3 A
    • D26 A

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    Explanation and discussion

15. Question 15· Current electricity· WAEC

    The resistance of a wire is doubled when its

    • Atemperature falls
    • Barea is doubled
    • Clength is doubled
    • Ddiameter doubles

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    Explanation and discussion