JAMB Physics questions: Current electricity

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

1. Question 1· 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

2. Question 2· 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

3. Question 3· 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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4. Question 4· 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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5. Question 5· 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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6. Question 6· 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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7. Question 7· 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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8. Question 8· 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

9. Question 9· 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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10. Question 10· 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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11. Question 11· 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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12. Question 12· Current electricity· JAMB

    Ohm's law states that, at constant temperature, the current through a conductor is proportional to the

    • Aresistance
    • Bpotential difference across it
    • Clength of the conductor
    • Dtime

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13. Question 13· Current electricity· JAMB

    Resistors of 2 Ω, 3 Ω and 5 Ω are connected in series to a 20 V supply. Find the current.

    • A4 A
    • B2 A
    • C10 A
    • D1 A

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14. Question 14· Current electricity· JAMB

    For a metal conductor, as its temperature rises, its resistance

    • Aincreases
    • Bdecreases
    • Cstays the same
    • Dfalls to zero

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15. Question 15· Current electricity· JAMB

    A copper wire is 10 m long with cross-sectional area 1 × 10⁻⁶ m². Find its resistance. (Resistivity of copper = 1.7 × 10⁻⁸ Ω m)

    • A0.17 Ω
    • B1.7 Ω
    • C0.017 Ω
    • D17 Ω

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16. Question 16· Current electricity· JAMB

    Resistors of 2 Ω, 3 Ω and 6 Ω are connected in parallel. Find their combined resistance.

    • A1 Ω
    • B11 Ω
    • C0.5 Ω
    • D3 Ω

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17. Question 17· Current electricity· JAMB

    A wire of resistance R is replaced by a wire of the same material with twice the length and half the cross-sectional area. Its resistance is

    • A2R
    • BR
    • C4R
    • DR/4

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18. Question 18· Current electricity· JAMB

    The resistivity of a material depends on

    • Athe nature of the material and its temperature
    • Bits length
    • Cits cross-sectional area
    • Dthe current

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19. Question 19· Current electricity· JAMB

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

    • A15 Ω
    • B6.7 Ω
    • C2.4 Ω
    • D20 Ω

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    Explanation and discussion