WAEC Physics questions: Electric cells

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

1. Question 1· Electric cells· WAEC

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

   • A0.75 A
   • B0.6 A
   • C3 A
   • D0.5 A

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2. Question 2· Electric cells· WAEC

   The e.m.f. of a cell is best measured when the cell is

   • Aconnected to a lamp
   • Bsupplying a large current
   • Cshort-circuited
   • Dsupplying no current

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3. Question 3· Electric cells· WAEC

   A battery of e.m.f. 12 V and internal resistance 2 Ω drives current through a 10 Ω lamp. Find the terminal p.d.

   • A10 V
   • B12 V
   • C2 V
   • D1.2 V

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4. Question 4· Electric cells· WAEC

   A cell of e.m.f. 9 V and internal resistance 1 Ω supplies a current of 2 A. The lost volts are

   • A7 V
   • B2 V
   • C9 V
   • D11 V

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5. Question 5· Electric cells· WAEC

   A lead-acid accumulator differs from a dry Leclanché cell in that it

   • Acan be recharged
   • Bcannot be recharged
   • Chas no electrolyte
   • Dgives no current

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6. Question 6· Electric cells· WAEC

   A new Leclanché cell is said to have a long shelf life. Which part of a simple voltaic cell, by contrast, is eaten away even when no current is drawn?

   • Athe copper plate
   • Bthe impure zinc plate
   • Cthe dilute acid
   • Dthe connecting wire

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7. Question 7· Electric cells· WAEC

   Local action in a simple cell can be reduced by

   • Ausing a stronger acid
   • Brubbing the zinc plate with mercury (amalgamation)
   • Cadding more copper
   • Dheating the cell

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8. Question 8· Electric cells· WAEC

   The positive pole of a Leclanché cell is the

   • Aammonium chloride paste
   • Bzinc case
   • Ccarbon rod
   • Dcopper wire

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9. Question 9· Electric cells· WAEC

   Two identical cells, each of e.m.f. 1.5 V, are connected in parallel. The combined e.m.f. is

   • A3.0 V
   • B1.5 V
   • C0.75 V
   • D2.25 V

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   Explanation and discussion