1. Sinusoidal response of circuits
The switch is closed at t = 0.
Determine the current i(t) for t >= 0.
ECE 201 Circuit Theory I

2. Write KVL around the loop
ECE 201 Circuit Theory I

3. The complete solution
ECE 201 Circuit Theory I

4. “Steady-State” solution (This is what we study now)
“Transient” solution
“Steady-State” solution
(This is what we study now)
ECE 201 Circuit Theory I

5. Steady-state solution
Sinusoidal
The frequency is the same as the frequency of the input signal
Maximum amplitude is different from that of the source
Phase angle differs from that of the source
ECE 201 Circuit Theory I

6. Solve for these
ECE 201 Circuit Theory I