Electrical Engineering - RC Circuits
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
. Current flow in the circuit is
. Current flow in the circuit is17.
For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is
18.
When the frequency of the voltage applied to a series RC circuit is increased, the phase angle
19.
In a series RC circuit, when the frequency and the resistance are halved, the impedance
20.
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?
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?73.4 and θ = –19.5°
and θ = –19.5°707 and θ = –19.5°
and θ = –19.5°2121 and θ = –19.5°
and θ = –19.5°734 and θ = –38.9°
and θ = –38.9°Answer: Option
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°
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