Exam 23: Alternating Current Circuits

An ac generator supplies a peak (not rms) voltage of 120.0 V at 60.0 Hz.It is connected in series with a 50.0- $\Omega$ resistor and a 0.500-H inductor. -What is the inductive reactance of the circuit?

An ac generator is connected across the terminals of a 3.25-µF capacitor.Determine the frequency at which the capacitive reactance is 375 $\Omega$ .

A series RCL circuit is comprised of a 3.00-mH inductor and a 5.00-µF capacitor.What is the resonant frequency of this circuit?

The graph shows the voltage across and the current through a single circuit element connected to an ac generator. -Determine the frequency of the generator.

What is the inductance of the inductor in a series RCL circuit with a resonant frequency of 640 Hz if the only other element in the circuit is a 1.2-µF capacitor?

An ac voltage source that has a frequency f is connected across the terminals of a capacitor.Which one of the following statements correctly indicates the effect on the capacitive reactance when the frequency is increased to 4f?

Two 3.25-µF capacitors are connected in series across the terminals of a 50.0-Hz ac generator that has a peak voltage of 244 V.Determine the rms current in the circuit.

Use the information given in the figure for the series RCL circuit to determine its total impedance.

An oscillating LC circuit has a resonant frequency of 1.2 × 10⁶ Hz.The diagram shows the system at t = 0 s when there is no charge on the capacitor and the current is in the direction shown.At this time, the energy stored in the inductor is 2.5 × 10^-7 J. -Which one of the following statements best explains why semiconductors in transistors are doped?

The voltage across and the current through a single circuit element connected to an ac generator are shown in the graph. -At what frequency do charges oscillate in this circuit?

The graph shows the voltage across and the current through a single circuit element connected to an ac generator. -Determine the rms current through this element.

An ac generator supplies an rms (not peak) voltage of 180 V at 60.0 Hz.The generator is connected in series with a 0.50-H inductor, a 6.0-µF capacitor and a 300- $\Omega$ resistor. -What is the average power supplied to the circuit?

A series RCL circuit operating at 60.0 Hz contains a 49- $\Omega$ resistor and an 5.0-µF capacitor.If the power factor of the circuit is +1.00, what is the inductance of the inductor in this circuit?

A variable capacitor is connected to an ac source.What effect does decreasing the capacitance have on the reactance and current in this circuit?

An ac generator supplies a peak (not rms) voltage of 150 V at 60.0 Hz.The generator is connected in series with a 35-mH inductor, a 45-µF capacitor and an 85- $\Omega$ resistor. -What is the power factor for this circuit?

Which circuit elements act to oppose changes in the current in an ac circuit?

The voltage across and the current through a single circuit element connected to an ac generator are shown in the graph. -Which one of the following statements concerning the impedance of an RCL circuit is true?

Complete the following statement: When the current in an oscillating LC circuit is zero,

An ac voltage source that has a frequency f is connected across the ends of an inductor.Which one of the following statements correctly indicates the effect on the inductive reactance when the frequency is increased to 2f?

An ac generator supplies a peak (not rms) voltage of 150 V at 60.0 Hz.The generator is connected in series with a 35-mH inductor, a 45-µF capacitor and an 85- $\Omega$ resistor. -What is the impedance of the circuit?