A series R-C circuit is connected to an alternating voltage source. Consider two situations:
i. When capacitor is air filled.
ii. When capacitor is mica filled.
Current through resistor is i and voltage across capacitor is V then:

A series LCR circuit (R = 30 Ω, $$\text X_\text L$$​ = 40 Ω, $$\text X_\text C$$​ = 80 Ω) is connected to an AC source of 200 V and 50 Hz. The power dissipated in the circuit is:

Consider a circuit with Resistance, Inductor and Capacitor connected in series. The phase difference between the current and the alternating voltage (at resonance) is: