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Inductors
A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?
78 mA
57 mA
91 mA
400 mA
78 mA
57 mA
91 mA
400 mA
Answer
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Related Question
Inductors
An inductance of 0.43 mH is smaller than
0.05 H
430 μH
0.00043 H
43 μH
0.05 H
430 μH
0.00043 H
43 μH
Answer
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Inductors
The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is
1.8 mV
180 mV
1.25 mV
18 mV
1.8 mV
180 mV
1.25 mV
18 mV
Answer
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Inductors
A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current
momentarily goes to zero
is decreased
does not change
is increased
momentarily goes to zero
is decreased
does not change
is increased
Answer
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Inductors
When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field
quadruples
is quartered
does not change
doubles
quadruples
is quartered
does not change
doubles
Answer
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Inductors
Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?
1.3 MΩ
66 kΩ
219 kΩ
660 kΩ
1.3 MΩ
66 kΩ
219 kΩ
660 kΩ
Answer
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