A2L Item 248

Goal: Link energy with electrical quantities

Source: 283-energy in L

Consider the following circuit. The switch S is closed at t = 0.
After a long time the energy stored in the inductor is:

  1. L^2^/R

  2. RL^2^/2

  3. LV/2R

  4. V/RL

  5. none of the above

Commentary:

Answer

(5) This is a good time to discuss with students the general form of
energy expressions as 1/2 something times (something else)^2^.