A 50 μF capacitor charged to 20 V stores how much energy?

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Multiple Choice

A 50 μF capacitor charged to 20 V stores how much energy?

Explanation:
Energy stored in a capacitor is given by E = 1/2 C V^2. Convert the capacitance to farads: 50 μF = 50 × 10^-6 F = 5.0 × 10^-5 F. With 20 V across it, E = 0.5 × (5.0 × 10^-5 F) × (20 V)^2 = 0.5 × 5.0e-5 × 400 = 0.01 J, which is 10 mJ.

Energy stored in a capacitor is given by E = 1/2 C V^2. Convert the capacitance to farads: 50 μF = 50 × 10^-6 F = 5.0 × 10^-5 F. With 20 V across it, E = 0.5 × (5.0 × 10^-5 F) × (20 V)^2 = 0.5 × 5.0e-5 × 400 = 0.01 J, which is 10 mJ.

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