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RC Circuits
RC Circuits
When the frequency of the voltage applied to a series RC circuit is decreased, the impedance
doubles
decreases
increases
remains the same
doubles
decreases
increases
remains the same
Answer
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RC Circuits
A capacitor with 150Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is
Z = 150 angle 180° Ω
Z = 150
Z = 150 angle – 90° Ω
Z = 150 –90° Ω
Z = 150 angle 180° Ω
Z = 150
Z = 150 angle – 90° Ω
Z = 150 –90° Ω
Answer
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RC Circuits
A 2 kΩ resistor and a 0.002 μF capacitor are in series across an ac source. Current in the circuit is 6.50 mA. The true power is
84.5 mW
845 mW
130 mW
13 mW
84.5 mW
845 mW
130 mW
13 mW
Answer
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RC Circuits
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
Z = 47Ω + j150Ω
Z = 197Ω
Z = 103Ω
Z = 47Ω – j150Ω
Z = 47Ω + j150Ω
Z = 197Ω
Z = 103Ω
Z = 47Ω – j150Ω
Answer
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RC Circuits
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?
14400Ω
4800Ω
37.9Ω
3.7Ω
14400Ω
4800Ω
37.9Ω
3.7Ω
Answer
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