A series circuit contains a light bulb (resistor), an inductor, and an AC power supply, driving the circuit at a frequency f.  The light bulb will be brightest at… A) high driving frequencies B) low driving frequencies C) neith

A 20-mH inductor is connected across an AC source with a variable frequency and a constant-voltage amplitude of 9.0 V. (a) Determine the reactance of the circuit and the maximum current through the inductor when the frequency Is set at 20 kHz. (b) Do the same calculations for a frequency of 60 Hz.

A 60.0-ft resistor is connected in series with a 30.0-F capacitor and a source whose maximum voltage is 120 V, operating at 60.0 Hz. Find (a) the capacitive reactance of the circuit, (b) the impedance of the circuit, and (c) the maximum current in the circuit. (d) Does the voltage lead or lag the current? (e) How will adding an inductor in series with the existing resistor and capacitor affect the current? Explain.

An AC generator with an rms emf of 15.0 V is connected in series with a 0.54-H inductor. The frequency of the source emf is 70.0 Hz. Draw a phasor diagram for this circuit, including the current, the potential difference across the inductor, and the source emf. Draw your diagram with the current phasor pointing toward the right along the horizontal axis.

P33.80a shows a parallel RLC circuit. The instantaneous voltages (and rms voltages) across each of the three circuit elements are the same, and each is in phase with the current in the resistor. The currents in C and L lead or lag the current in the resistor as shown in the current phasor diagram, Figure P33.80b. (a) Show that the rms current delivered by the source is Irms=Vrms[1R2+(C1L)2]12 (b) Show that the phase angle between Vrms and Irms is given by tan=R(1Xc1XL)

Neon signs require 12-kV for their operation. A transformer is to be used to change the voltage from 220-V (rms) ac to 12-kV (rms) ac. What must the ratio be of turns in the secondary winding to the turns in the primary winding? (b) What is the maximum rms current the neon lamps can draw if the fuse in the primary winding goes off at 0.5 A? (C) How much power is used by the neon sign when it is drawing the maximum current allowed by the fuse in the primary winding?

Find the reactances of the following capacitors and inductors in ac circuits with the given frequencies in each case: (a) 2-mH inductor with a frequency 60-Hz of the ac circuit; (b) 2-mM Inductor with a frequency 600-Hz of the ac circuit; (C) 20-mM inductor with a frequency 6-Hz of the ac circuit; (d) 20-mM inductor with a frequency 60-Hz of the ac circuit; (e) 2-mF capacitor with a frequency 60-Hz of the ac circuit; and (f) 2-mF capacitor with a frequency 600-Hz of the AC circuit.

An RLC series circuit has a 2.50 (resistor, a 100 (H inductor, and an 80.0 (F capacitor. (a) Find the circuit's impedance at 120 Hz. (b) Find the circuit’s impedance at 5.00 kHz. (c) If the voltage source has Vrms = 5.60 V, what is Irms at each frequency? (d) What is the resonant frequency of the circuit? (e) What is Irms at resonance?

An RLC series circuit hag a 1.00 k(register, a 150 (H inductor, and a 25.0 nF capacitor. (a) Find the circuit’s impedance at 500 Hz. (b) Find the circuit’s impedance at 7.50 kHz. (c) It the voltage source has Vrms = 408 V, what is Irms at each frequency? (d) What is the resonant frequency of the circuit? (e) What is Irms at resonance?

Suppose you connect a small lightbulb across a DC power supply that has an emf of 5.0 V. You then connect the bulb across a 60.0-Hz AC power supply that has an rms voltage of 5.0 V. Does the bulb dissipate more power on average when it is connected to the DC power supply or the AC power supply? Is the bulb brighter when it is connected to the DC power supply or the AC power supply? Explain.