Potential dividers Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. A 10 kΩ and a 30 kΩ resistor are in series across a 12 V supply. What is the p.d. across the 10 kΩ resistor?
- A. 3.0 V
- B. 9.0 V
- C. 4.0 V
- D. 6.0 V
2. A thermistor (NTC) and a fixed resistor are in series with the output across the thermistor. The temperature rises. What happens to the output p.d.?
- A. It increases
- B. It decreases
- C. It stays the same
- D. It becomes zero immediately
3. A 1.00 m uniform wire is connected across a 4.0 V cell. What is the p.d. between one end and a contact 0.25 m along it?
- A. 4.0 V
- B. 0.25 V
- C. 2.0 V
- D. 1.0 V
4. Why does the output p.d. of a divider fall when a load is connected across it?
- A. The supply p.d. decreases
- B. The load is in parallel and lowers the combined resistance
- C. The load is in series with the divider
- D. The current in the supply decreases
5. In an LDR divider with the output across the fixed resistor, the room gets brighter. The LDR resistance falls. The output p.d.:
- A. falls
- B. stays the same
- C. rises
- D. falls to zero