JAMB Physics questions: Electric cells

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

1. Question 1· Electric cells· JAMB

   The e.m.f. of a cell is best measured with a

   • Aammeter
   • Bpotentiometer
   • Cohmmeter
   • Dgalvanometer used alone

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   Explanation and discussion

2. Question 2· Electric cells· JAMB

   In a Leclanché dry cell, the positive terminal is the

   • Amanganese(IV) oxide only
   • Bzinc case
   • Cammonium chloride paste
   • Dcarbon rod

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3. Question 3· Electric cells· JAMB

   Polarisation in a simple cell is caused by

   • Aimpurities in the zinc
   • Bhydrogen bubbles collecting on the copper plate
   • Cthe acid becoming too strong
   • Dthe cell overheating

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4. Question 4· Electric cells· JAMB

   Three cells, each of e.m.f. 1.5 V and internal resistance 0.5 Ω, are connected in series. Find the total e.m.f. and internal resistance.

   • A1.5 V and 0.5 Ω
   • B4.5 V and 1.5 Ω
   • C4.5 V and 0.17 Ω
   • D1.5 V and 1.5 Ω

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5. Question 5· Electric cells· JAMB

   A cell of e.m.f. 3 V and internal resistance 1 Ω drives a current through a 5 Ω resistor. Find the terminal potential difference of the cell.

   • A3 V
   • B2.5 V
   • C0.5 V
   • D2 V

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6. Question 6· Electric cells· JAMB

   An advantage of the lead-acid accumulator over a dry cell is that it

   • Anever runs down
   • Bis lighter
   • Ccontains no liquid
   • Dcan be recharged

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7. Question 7· Electric cells· JAMB

   Connecting identical cells in parallel gives

   • Aa larger e.m.f.
   • Bthe same e.m.f. as one cell with a smaller internal resistance
   • Czero e.m.f.
   • Da larger internal resistance

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8. Question 8· Electric cells· JAMB

   Local action in a simple cell is caused by

   • Aimpurities in the zinc plate
   • Bhydrogen bubbles on the copper
   • Ctoo much acid
   • Da short circuit

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9. Question 9· Electric cells· JAMB

   A lead–acid accumulator is

   • Aa solar cell
   • Ba primary cell
   • Ca dry Leclanché cell
   • Da secondary cell that can be recharged

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10. Question 10· Electric cells· JAMB

    The electromotive force (e.m.f.) of a cell is the

    • Acurrent it produces
    • Bforce on electrons
    • Cenergy it supplies to each coulomb of charge passing through
    • Dresistance inside it

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11. Question 11· Electric cells· JAMB

    A cell of e.m.f. 3 V and internal resistance 1 Ω is connected to a 5 Ω resistor. Find the current.

    • A3 A
    • B0.6 A
    • C0.5 A
    • D0.75 A

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12. Question 12· Electric cells· JAMB

    Two cells, each of e.m.f. 1.5 V and internal resistance 0.5 Ω, are connected in series with a 4 Ω resistor. Find the current.

    • A0.33 A
    • B0.75 A
    • C0.6 A
    • D3 A

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    Explanation and discussion