What is the phase difference between $V$ and $I$ in a circuit containing only a resistor?

An $AC$ source is connected to a capacitor $C$. Due to a decrease in its operating frequency:

$A$ $15.0 \mu\text{F}$ capacitor is connected to a $220 \text{ V}$, $50 \text{ Hz}$ source. The capacitive reactance of the circuit is . . . . . . $\Omega$.

$A$ lamp is connected in series with a capacitor. Predict your observations for $dc$ and $ac$ connections. What happens in each case if the capacitance of the capacitor is reduced?

Explain the dissipation of electrical energy when an alternating current passes through a resistor.

$L$, $C$ and $R$ are connected in series to an $A.C.$ source. Which one of the following is true? Phase relation between current and voltage is such that