E.m.f. and internal resistance Quiz
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5 questions, one answer each
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1. A cell of e.m.f. 3.0 V and internal resistance 1.0 Ω is connected to a 5.0 Ω resistor. What is the terminal p.d.?
- A. 2.5 V
- B. 0.50 V
- C. 3.0 V
- D. 2.0 V
2. A graph of terminal p.d. against current has an intercept of 9.0 V and a gradient of −1.5 V A⁻¹. What is the internal resistance?
- A. 9.0 Ω
- B. 6.0 Ω
- C. 1.5 Ω
- D. 0.17 Ω
3. What is the maximum current a 12 V battery of internal resistance 0.020 Ω can supply?
- A. 0.24 A
- B. 600 A
- C. 12 A
- D. 6.0 A
4. Which statement about the e.m.f. of a cell is correct?
- A. It is the p.d. across the cell when a current is drawn
- B. It is a force measured in newtons
- C. It is always smaller than the terminal p.d.
- D. It is the energy transferred to electrical energy per unit charge
5. As the current drawn from a cell increases, the terminal p.d.:
- A. increases
- B. falls as the lost volts increase
- C. stays the same
- D. equals the e.m.f.