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Physics (AS & A Level) · May / June 2019 · Paper 11 · Question 36

9702Practical circuits

A cell is connected to a resistor of resistance 3.00 Ω. The current in the resistor is 1.00 A. A second identical resistor is added in parallel. The current becomes 1.93 A. What are the e.m.f. E and internal resistance r of the cell?

  1. AE = 0.113 V, r = 3.11 Ω
  2. BE = 3.04 V, r = 0.0358 Ω
  3. CE = 3.11 V, r = 0.113 Ω
  4. DE = 9.34 V, r = 6.34 Ω

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Correct answer: C. E = 3.11 V, r = 0.113 Ω

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