A 20-μF capacitor has a charge of 60 μC. How much energy is stored in this capacitor?

Question

Quizplus · Accepted Answer

The formula for calculating the energy stored in a capacitor is:

E = (1/2) CV^2

Where E is the energy, C is the capacitance, and V is the voltage across the capacitor.

To find the voltage, we can use the formula:

Q = CV

Where Q is the charge on the capacitor.

V = Q/C = 60 μC / 20 μF = 3 V

Now we can use the energy formula to calculate the energy stored in the capacitor:

E = (1/2) CV^2 = (1/2) * 20 μF * (3 V)^2 = 90 μJ

Therefore, the answer is C.

A 20-μF Capacitor Has a Charge of 60 μC