What is the relationship between current (I) and voltage (E) in a circuit consisting of a capacitor in series with a resistor?

Question

Question

This question was previously asked in

IPRC (ISRO) Technician B (Electronic Mechanic): Previous Year Paper (Held on 10 Dec 2016)

Answer 1

Key Points

In a pure resistive circuit, the current is in phase with the voltage. Hence the power factor is unity
In a pure capacitive circuit, current leads the voltage by 90°. Hence the power factor is zero leading
In a circuit consists of a resistor and a capacitor, the current lead the voltage by an angle less than 90° and it is leading.
Since V = IR across the resistor, and the imaginary part of resistance is zero across a resistor, the voltage and the current will be in phase across the resistor.