Current, potential difference and resistance Quiz
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5 questions, one answer each
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1. A current of 0.40 A flows for 50 s. How much charge flows?
- A. 0.008 C
- B. 20 C
- C. 125 C
- D. 50.4 C
2. A resistor has a p.d. of 9.0 V across it and a current of 0.30 A. What is its resistance?
- A. 30 Ω
- B. 2.7 Ω
- C. 0.033 Ω
- D. 9.3 Ω
3. How should a voltmeter be connected to measure the p.d. across a lamp?
- A. In series with the lamp
- B. In parallel with the lamp
- C. Between the battery and the switch only
- D. It does not matter
4. As the light level on an LDR falls, its resistance...
- A. falls
- B. stays the same
- C. rises
- D. falls to zero
5. A student investigates how the length of a wire affects its resistance. Which is a control variable?
- A. The length of the wire
- B. The resistance of the wire
- C. The thickness of the wire
- D. The number of lengths tested