Question

For RLC circuits, as frequency increases, how does the phase relation between 1) voltage of a resistor and voltage of an inductor change and 2) the current and generator voltage change?

Answer 1

1.

Case of resistor:- Resistance is independent of frequency, so it remains constant with change in frequency

Case of inductor:- We have for inductor ,XL = 2πfL. So, inductive reactance varies directly with frequency.

2.

In case of resistor, the voltage and the current are in same phase or we can say that the phase angle difference between voltage and current is zero.

In inductor, the voltage and the current are not in phase. The voltage leads that of current by 90° or in the other words, voltage attains its maximum and zero value 90° before the current attains it.