EXAMIANS
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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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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If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit
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To increase the current in a series RL circuit, the frequency
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A 3.3 kΩ resistor and a 120 mH coil are in parallel. Both components are across a 2 kHz, 12 V ac source. The total current in the circuit is
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In a series RL circuit, 12 V rms is measured across the resistor, and 14 V rms is measured across the inductor. The peak value of the source voltage is
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When the frequency is decreased, the impedance of a parallel RL circuit
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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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When the frequency of the voltage applied to a series RL circuit is increased, the phase angle
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Referring to Problem 23, the reactive power is
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