Exercise :: RC Circuits - General Questions
- RC Circuits - General Questions
- RC Circuits - True or False
| 16. | A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 k |
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. Current flow in the circuit is| 17. | 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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| 18. | When the frequency of the voltage applied to a series RC circuit is increased, the phase angle |
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| 19. | In a series RC circuit, when the frequency and the resistance are halved, the impedance |
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| 20. | A 2 k |
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Answer: Option C Explanation: Xc = 1/2πfC = 707 Ω Z = R - jXc = 2000 - j(707) |z| = sqrt(R*R + Xc*Xc) = 2121 Ω Phase angle = arctangent(Xc/R) = 19.5° |
F capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle?