Question

What is time constant of LCR circuits? Derive it's expression?

Answer 1

Answer:

Explanation:

This term is known as time constant. So time constant is the duration in seconds during which the current through a capacities circuit becomes 36.7 percent of its initial value. This is numerically equal to the product of resistance and capacitance value of the circuit. Time constant is normally denoted by τ (tau).

Alternating Current. Derive an expression for the impedance of a series LCR circuit connected to an AC supply of variable frequency. ... The voltage VR and current i are in the same phase, the voltage VL will lead the current by angle 90° while the voltage VC will lag behind the current by 90°.

Hope it helps.