Exam 23: Alternating Current Circuits

Two series RCL circuits have the same resonant frequency.Circuit A has an inductance of 0.55 H and circuit B has an inductance of 0.15 H.Determine the ratio of the capacitances of the circuits, C_A/C_B.

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 phase angle for this circuit?

A 14.0-µF capacitor and a 1480- $\Omega$ resistor are connected in series to a generator operating at 50.0 Hz and producing an rms voltage of 208 V.What is the average power dissipated in this circuit?

Determine the peak (not rms) voltage of the ac generator.

Complete the following statement: The main difference between an npn transistor and a pnp transistor is that

Use the information given in the figure for the series RCL circuit to determine the phase angle between the current and the voltage.

The voltage across and the current through a single circuit element connected to an ac generator are shown in the graph. -When the frequency of an ac circuit is increased at constant voltage, the current increases and then decreases.Which combination of elements is most likely to comprise this circuit?

Which one of the following materials would be in an n-type semiconductor?

Two 250-µF capacitors and a 1.5-mH inductor are connected as shown in the figure.It is desired to "drive" the circuit by placing an ac generator in series with the inductor.Which one of the following generator output voltages will produce the largest current in the above circuit? Assume that V is in volts when t is in seconds.

The table below shows the values of the resistance, capacitive reactance, and inductive reactance for five RCL circuits.Which circuit will have a negative phase angle?

A 315- $\Omega$ resistor is connected in series with a parallel-plate capacitor across the terminals of a 60.0-Hz ac generator.When the gap between the plates is empty, its capacitance is 2.65 µF.Determine the ratio of the rms current in the circuit when the capacitor is empty to that when ruby mica ( $\kappa$ = 5.40) is inserted between the plates?

What is the average power consumed by the circuit?

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 peak (not rms) current through the resistor?

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 is true for this circuit?

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 average power dissipated in the circuit?

In the circuit shown in the drawing, the generator supplies the same amount of rms current at either very small or very large frequencies.What can be deduced about the resistances R₁, R₂, and R₃ from this information?

The voltage across and the current through a single circuit element connected to an ac generator are shown in the graph. -Determine the reactance of this circuit element.

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

What is the capacitive reactance of a circuit comprised of a 65.0-µF capacitor and a 50.0-Hz generator?

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 capacitive reactance for this circuit?