Current, potential difference and resistance Quiz
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5 questions, one answer each
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1. A current of 2.0 A flows for 30 s. What charge passes?
- A. 15 C
- B. 32 C
- C. 60 C
- D. 0.067 C
2. Which unit is equivalent to the volt?
- A. A s⁻¹
- B. J C⁻¹
- C. C J⁻¹
- D. W A
3. A resistor has 9.0 V across it and carries 0.30 A. What is its resistance?
- A. 2.7 Ω
- B. 0.033 Ω
- C. 30 Ω
- D. 3.0 Ω
4. Which statement about Ohm's law is correct?
- A. It applies to all components at any temperature.
- B. It is the definition of resistance.
- C. It states I ∝ V for a metallic conductor at constant temperature.
- D. It states V ∝ I only for semiconductors.
5. The current in a lamp rises from 0.50 A to 0.80 A when the p.d. rises from 2.0 V to 4.0 V. What happens to its resistance?
- A. It stays at 4.0 Ω
- B. It rises from 4.0 Ω to 5.0 Ω
- C. It falls from 5.0 Ω to 4.0 Ω
- D. It doubles