Capacitor charge and discharge Quiz
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5 questions, one answer each
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1. A 2200 µF capacitor discharges through a 4.7 kΩ resistor. What is the time constant?
- A. 4.7 s
- B. 10 s
- C. 2.1 × 10⁻³ s
- D. 1.0 × 10⁷ s
2. A capacitor discharges with a time constant of 8.0 s. What is the time for the charge to halve?
- A. 8.0 s
- B. 12 s
- C. 5.5 s
- D. 16 s
3. A capacitor initially charged to 12 V discharges with RC = 5.0 s. What is the p.d. after 10 s?
- A. 4.4 V
- B. 6.0 V
- C. 1.6 V
- D. 0.0 V
4. A capacitor is charging through a resistor. Which graph shape is correct?
- A. V and I both rise
- B. V rises exponentially and I falls exponentially
- C. V falls and I rises
- D. V and I both fall exponentially
5. A graph of ln V against t for a discharging capacitor has gradient −0.20 s⁻¹. What is RC?
- A. 0.20 s
- B. −5.0 s
- C. 0.69 s
- D. 5.0 s