EEE :: Inductors
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The winding resistance of a coil can be increased by
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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
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The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is
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When the current through an inductor decreases, the amount of energy stored in the electromagnetic field
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An 18 V power supply is connected across a coil with a winding resistance of 180
. Current flow in the coil is -
A switch, a 220
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? -
A 320
H coil is in series with a 3.3 k resistor. How long does it take for current to build up to its full value? -
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
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