A solenoid valve coil has inductance and winding resistance

PHYSICS · Multi-part · Fermi University Physics · Electricity, Magnetism & Electromagnetism · Electric current and circuits · Electric current and circuits

Electronics for Measurement, Ch Capacitors, inductors and the time constant

Problem

A solenoid valve coil has inductance

L = 200\,\mathrm{mH}

and winding resistance

R = 40\,\Omega

. It is connected across an ideal

12\,\mathrm{V}

source through an ideal switch that closes at

t = 0

, with no current flowing beforehand. ((a)) State the time constant

\tau

of the circuit. ((b)) Find the coil current

i_L

t = 5\,\mathrm{ms}

. ((c)) Find the energy stored in the coil once it has reached its final current.

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