Current, potential difference and resistance Quiz
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5 questions, one answer each
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1. A current of 3.0 A flows for 40 s. How much charge passes?
- A. 13 C
- B. 43 C
- C. 120 C
- D. 0.075 C
2. How much energy is transferred when 12 C of charge passes through a p.d. of 6.0 V?
- A. 0.50 J
- B. 2.0 J
- C. 18 J
- D. 72 J
3. A lamp has a p.d. of 12 V across it and a current of 0.50 A. What is its resistance?
- A. 24 Ω
- B. 0.042 Ω
- C. 6.0 Ω
- D. 12.5 Ω
4. An ohmic conductor carries 0.20 A at 4.0 V. What is the current at 10 V, at the same temperature?
- A. 0.08 A
- B. 0.50 A
- C. 2.0 A
- D. 50 A
5. Why does the resistance of a filament lamp increase as the p.d. across it increases?
- A. More electrons are released into the circuit
- B. The p.d. directly increases the resistance
- C. The filament becomes shorter
- D. The filament gets hotter, so the lattice ions vibrate more and collide more often with electrons