Exam-style question
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A capacitor with a capacitance of 4 F is charged to a potential difference of 5 V. How much energy is stored in the capacitor?.
- A.10 J
- B.20 J
- C.40 J
- D.50 J
Model answer
What a good answer should say
- 10 J
Explanation
Why this works
Using the energy formula E = 0.5 * C * V^2, we substitute: E = 0.5 * 4 F * (5 V)^2 = 0.5 * 4 * 25 = 50 J. Thus, the energy stored is 50 joules.
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