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Inductors

Inductors
An 18 V power supply is connected across a coil with a winding resistance of 180 . Current flow in the coil is

100 mA
10 mA
1 A
1 mA

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Inductors
Five inductors are connected in series. The lowest value is 8 μH. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is

64 μH
8 H
32 μH
248 μH

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Inductors
The voltage across a coil when di/dt = 20 mA/s and L = 8 H is

1.6 mV
2.5 mV
160 mV
16 mV

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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?

400 mA
78 mA
91 mA
57 mA

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Inductors
A 240 H inductor is equivalent to a

240 mH inductor
0.240 mH inductor
0.000240 mH inductor
240 H inductor

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Inductors
An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then

VR ≥ VL
VL = VR
VL < VR
VL > VR

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