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RC Circuits

RC Circuits
The complex number 40 angle 55° is equivalent to

40 + j40
22.94 + j32.76
45.88 + j65.52
55 + j55

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RC Circuits
When the frequency of the source voltage decreases, the impedance of a parallel RC circuit

does not change
decreases
increases
decreases to zero

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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 – 90° Ω
Z = 150 –90° Ω
Z = 150 angle 180° Ω
Z = 150

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RC Circuits
In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is

141 mA
200 mA
100 mA
282 mA

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RC Circuits
The voltages in Problem 4 are measured at a certain frequency. To make the capacitor voltage greater than the resistor voltage, the frequency

must be decreased
is held constant
must be increased
has no effect

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RC Circuits
An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:

R = XC
R > XC
R < XC
R = 5XC

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