If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit
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Electrical Engineering · all questionsRL Circuits
RL Circuits
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A filter passes certain frequencies and rejects others.
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When the frequency of the voltage applied to a series RL circuit is decreased, the impedance decreases
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When the frequency is decreased, the impedance of a parallel RL circuit
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In an RL circuit, the impedance is determined by both the resistance and the inductive reactance combined.
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A 1.5 kΩ resistor and a coil with a 2.2 kΩ inductive reactance are in series across an 18 V ac source. The power factor is
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Total current in an RL circuit always lags the source voltage.
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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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The phase angle (θ) of a series RL circuit varies directly with frequency.
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A 140 Ω resistor is in parallel with an inductor having 60 Ω inductive reactance. Both components are across a 12 V ac source. The magnitude of the total impedance 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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When the frequency of the voltage applied to a series RL circuit is decreased, the impedance
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A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.3 ∠0° mA. The source voltage, expressed in polar form, is
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A 47 Ω resistor is in series with an inductive reactance of 120 Ω across an ac source. The impedance, expressed 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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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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In an RL circuit, part of the power is resistive and part is reactive.
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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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A 470 Ω resistor and a coil with 125 Ω inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is
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The power factor indicates how much of the apparent power is reactive power.
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