Discussion
Time constant for an R-L series circuit is given by :
Answer: A
The time constant is \(\tau = \frac{L}{R}\).
When a dc voltage is switched onto an R-L series circuit, the current rises as \(i = I\left(1 - e^{-Rt/L}\right)\). The time constant is the time in which the current would reach its final value if it kept its initial rate of rise; in practice it is the time to reach 63.2 per cent of the final value. Henry divided by ohm gives seconds.
R/L is the reciprocal, with units of 1/second. RL has units of ohm-henry, not time, and 1/RL is no better. The R-C circuit's time constant is RC, which may be the source of the RL trap.
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