E.m.f. and internal resistance Quiz
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5 questions, one answer each
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1. Which quantity is the same whatever current the cell supplies?
- A. Terminal potential difference
- B. E.m.f.
- C. Lost volts
- D. Power dissipated in the cell
2. A cell of e.m.f. 6.0 V and internal resistance 2.0 Ω supplies a current of 1.5 A. What is its terminal potential difference?
- A. 3.0 V
- B. 4.5 V
- C. 5.0 V
- D. 9.0 V
3. A student plots V against I for a cell. The intercept on the V axis is 4.5 V and the gradient is −1.8 V A⁻¹. What is the internal resistance?
- A. 0.40 Ω
- B. 1.8 Ω
- C. 2.5 Ω
- D. 4.5 Ω
4. A cell of e.m.f. 2.0 V and internal resistance 0.50 Ω is short circuited. What is the current?
- A. 0.25 A
- B. 1.0 A
- C. 2.5 A
- D. 4.0 A
5. Why does the terminal pd of a cell fall when it supplies a larger current?
- A. The e.m.f. of the cell decreases
- B. More energy per coulomb is dissipated in the internal resistance
- C. The charge in the cell is used up faster
- D. The external resistance increases