Potential dividers Quiz
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5 questions, one answer each
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1. A 12 V supply is across 8.0 kΩ and 4.0 kΩ resistors in series. What is the p.d. across the 4.0 kΩ resistor?
- A. 8.0 V
- B. 6.0 V
- C. 4.0 V
- D. 3.0 V
2. In a divider with the output across a fixed resistor and an NTC thermistor as the other resistor, what happens to the output as the temperature rises?
- A. It decreases
- B. It increases
- C. It stays constant
- D. It becomes zero
3. A 9.0 V supply is across a 6.0 kΩ and a resistor R in series. The p.d. across R is 3.0 V. What is R?
- A. 3.0 kΩ
- B. 6.0 kΩ
- C. 12 kΩ
- D. 3.0 Ω
4. Why is a very high resistance voltmeter used to measure the output of a potential divider?
- A. To increase the current
- B. To draw negligible current
- C. To increase the supply p.d.
- D. To reduce the resistance of the divider
5. The output of a divider is across an LDR, with a fixed resistor as the other component. What happens to the output as the room gets brighter?
- A. It increases
- B. It stays constant
- C. It decreases
- D. It equals the supply p.d.