The initially relaxed circuit of Figure P4-1 is excited at t Determine all element voltages and currents at t = 0^+. Solution at t=0+, the switch is closed and inductor act as short circuit and capacitor act as a open circuit. now apply KVL, -24+3I=0 I=8A current thorough inductor is 8A, resitor R1 is 0A, resistor R2 is 8A, voltage across indictor and R1 is 0V, capacitor and R2 is 24 V.