EXAMIANS
A 470Ω resistor and a coil with 125Ω inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is
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A 1.2 kΩ resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is
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Which of the following power factors results in less energy loss in an RL circuit?
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When the frequency is decreased, the impedance of a parallel RL circuit
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When the frequency of the voltage applied to a series RL circuit is increased, the phase angle
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When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle
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Referring to Problem 23, the reactive power is
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A 470Ω resistor and a 200 mH coil are in parallel. Both components are across a 1.5 kHz ac source. The total admittance of the circuit, in polar form, is
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If a load is purely inductive and the reactive power is 12 VAR, the apparent power is
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A 47Ω resistor is in series with an inductive reactance of 120Ω across an ac source. The impedance, expressed in polar form, is
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