- An AC series circuit consists of a resistor with resistance of \( 90 \Omega \), a coil with inductance of \( 1.3 H \) and a capacitor with capacitance of \( 10 \mu F \). The circuit is connected to an AC voltage source with amplitude of \( 100 V \) and frequency of \( 50 Hz \). Write an equation for instantaneous values of voltage and current in the circuit, if the initial phase of the current is zero. Use a phasor diagram to answer the above question.
