What is the time constant of the following circuit?

Question

Question

This question was previously asked in

LPSC (ISRO) Technician B (Electronic Mechanic): Previous Year Paper (Held on 23 Feb 2020)

Answer 1

Concept:

The time constant is defined as the time required for the circuit to reach 68% of the final value (steady-state value).

The time constant (τ) of a series RC circuit is given by:

τ = RC

Calculation:

Given R = 2 kΩ and C = 0.25 μF

Time constant (τ) will be:

τ = 2 k × 0.25 μ = 0.5 msec, or

τ = 500 μ sec

26 June 1

For a series RL circuit, the time constant (τ) is given by:

\(\tau = \frac{L}{R}\)