Exam 32: Electronics

A 25.0-mH inductor,a 2.00-μF capacitor,and a certain resistor are connected in series across an ac voltage source at 1000 Hz.If the impedance of this circuit is 200 Ω,what is the resistance of the resistor?

A series LRC ac circuit has a resistance of 4.0 kΩ,a capacitance of 33.0 μF,and an inductance of 23.0 H.If the frequency of the alternating current is 2.0/π kHz,what is the phase angle between the voltage and the current?

A resistor is connected to an ideal ac power supply. (a)The phase angle between the current and voltage is A)0 B)π/2 radians. C)-π/2 radians. D)π radians. E)3π/4 radians. (b)The current in the resistor A)leads the voltage across the resistor by 90°. B)lags the voltage across the resistor by 90°. C)is in phase with the voltage across the resistor. D)the voltage across the resistor by 45°. E)lags the voltage across the resistor by 45°. (c)How does the average power dissipated in the resistor change as the frequency in the ac power supply decreases? A)It decreases. B)It increases. C)It does not change. D)It increases or decreases depending on the sign of the phase angle.

Which one of the phasor diagrams shown below best represents a series LRC circuit driven at resonance?

An LRC ac circuit has a reactance (due to its capacitance)of 17 kΩ,a reactance (due to its inductance)of 9.0 kΩ,and a resistance of 28 kΩ.What is the power factor of the circuit?

A series LRC circuit has a sinusoidal voltage supplied to it at 197 kHz with a peak voltage of 270 V,a 41-kΩ resistance,a 14-µF capacitor,and a 63-H inductance.What is the peak current for this circuit?