**Goal:** Reason regarding RC circuits.

**Source:** 283 – energy dissipated in RC circuit

Consider the following circuit. The capacitor is uncharged when

switch S is closed at t = 0. During the charging process the total

energy dissipated in the resistor is:

- V^2^/R
- CV^2^/2
- QV
- V/RC
- none of the above

## Commentary:

## Answer

(2) Students should recognize that if the capacitor ultimately is

charged to Q, the total work done by the battery is QV. Half of this is

stored in the capacitor and half is dissipated in the resistor.