What battery is needed to charge a capacitor?

Your friend provides you with a $10 μ F$ capacitor. To store $120 μ C$ on this capacitor, what voltage battery should you buy?

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Strategy
Use the equation $C = Q / V$ to find the voltage needed to charge the capacitor.
Solution
Solving $C = Q / V$ for the voltage gives $V = Q / C$ . Inserting $C = 10 μ F = 10 \times 10^{−6} F$ and $Q = 120 μ C = 120 \times 10^{−6} C$ gives
$V = \frac{Q}{C} = \frac{120 \times 10^{−6} C}{10 \times 10^{−6} F} = 12 V$
18.41

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