EXAMIANS
An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:
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A 2 k resistor is in series with a 0.015 F capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle?
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When the frequency of the source voltage decreases, the impedance of a parallel RC circuit
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A 120Ω resistor is in parallel with a capacitor with a capacitive reactance of 40 Ω. Both components are across a 12 V ac source. What is the magnitude of the total impedance?
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The voltages in Problem 4 are measured at a certain frequency. To make the capacitor voltage greater than the resistor voltage, the frequency
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For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is
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The complex number 40 angle 55° is equivalent to
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A 47Ω resistor and a capacitor with 150Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is
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A capacitor with 150Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is
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A 12 kΩ resistor is in series with a 0.02 μF capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.3 angle 0° mA, what is the source voltage expressed in polar form?
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