Capacitance and energy stored Quiz
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5 questions, one answer each
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1. What is the capacitance of a capacitor that stores 6.0 mC at 12 V?
- A. 500 μF
- B. 72 μF
- C. 2.0 μF
- D. 0.50 μF
2. A 100 μF capacitor is charged to 20 V. How much energy does it store?
- A. 2.0 × 10⁻³ J
- B. 4.0 × 10⁻² J
- C. 1.0 × 10⁻³ J
- D. 2.0 × 10⁻² J
3. The p.d. across a capacitor is tripled. By what factor does the stored energy change?
- A. 3
- B. 6
- C. 9
- D. 1/3
4. What does the area under a graph of p.d. against charge for a capacitor represent?
- A. The capacitance
- B. The energy stored
- C. The current
- D. The time constant
5. Which expression gives the energy stored in terms of charge and capacitance?
- A. Q²/2C
- B. QC/2
- C. 2Q²/C
- D. Q/2C²