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kph2015 kph2015
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Posts: 8
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10 years ago
A 25.0-mH inductor is connected in series to a 20.0-Ω resistor through a 15.0-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the time constant of this circuit?


0.800×10-3 s
0.800×10-2 s
0.500 s
1.25×10-3 s
12.5×10-2 s
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wrote...
Staff Member
Educator
10 years ago
time constant = L/R = 25x10^-3/20 = 1.25 milli seconds
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