A simple series circuit contains a $6.0 - \Omega$ resistor, an ideal $15 - \mathrm { V } D C$ power supply, and an $18 - \mathrm { H }$ inductor. What the time constant of this circuit?
A) $0.33 \mathrm {~s}$
B) $110 \mathrm {~s}$
C) $3.0 \mathrm {~s}$
D) None of the given answers are correct.

Question

Quizplus · Accepted Answer

The time constant $\tau$ for an RL circuit is given by $\tau = \frac{L}{R}$. Here, $L = 18 \, \mathrm{H}$ and $R = 6 \, \Omega$, so $\tau = \frac{18}{6} = 3.0 \, \mathrm{s}$.

A Simple Series Circuit Contains A 6.0−Ω6.0 - \Omega6.0−Ω Resistor, an Ideal

A Simple Series Circuit Contains A $6.0 - \Omega$ Resistor, an Ideal