UR(t) be the voltage across the resistor at time t;
ir(t) be the current through the resistor at time t;
VL (t) be the voltage across the inductor at time t;
iz(t) be the current through the inductor at time t;
vc (t) be the voltage across the capacitor at time t;
ic (t) be the current through the capacitor at time t.
Fig: 1
Fig: 2