A2L Item 253

Goal: Reason regarding inductors

Source: 283-755 RL equivalent circuit at t small

Consider the following circuit.

The switch is closed at t=0. Which circuit is equivalent to this circuit
for the instant immediately after the switch is closed?



(2) Some students misunderstand the statement that inductors behave
initially as an open circuit and select #1 or #3.

This item is best used in conjunction with the next one. Both should be
asked before discussion of either to reveal whether students just have
the behaviors reversed or evidence a more serious problem.