212 - Problem Set #09

Physics 212 Fall 2008 Problem Set #9 Read: 21.1 - 21.5 and then do the problems. Due on Monday, October 20th.

1)An rms voltage of 100 V is applied to a purely resistive load

of 5.0 Ω. Find (a) the maximum voltage applied, (b) the rms current supplied, and (c) the maximum current supplied.

2)A 7.5 µF capacitor is attached to an AC source. reactance of 168 Ω. source?

It has a

What is the frequency of the AC

3)An inductor has a reactance of 480 Ω when attached to an AC source of frequency 1350 Hz. when the frequency is 450 Hz?

What is the reactance

4)An AC source, a 275 Ω resistor, an inductor of inductive reactance 648 Ω, and a capacitor of capacitive reactance 415 Ω are arranged to form a series RLC circuit. The current in the circuit is 0.233 A. Calculate the voltage of the AC source.

5)A

6)An AC source produces a current of 0.04 A at a frequency of 4.8 kHz when attached to a 232 Ω resistor and a 0.25 µF capacitor that are connected in series. Calculate (a) the voltage of the generator and (b) the phase angle between the current and the voltage across the resistor/capacitor combination.

7)A 215 Ω resistor and a 0.2 H inductor are connected in series with an AC source of 234 V and frequency 106 Hz. (a) What is the current in the circuit? (b) Calculate the phase angle between the current and the voltage of the AC source.

8)An RLC circuit containing a 10 Ω resistor, a 17 mH inductor, and a 12 µF capacitor are connected in series with a 155 V RMS AC source. (a) Calculate the frequency of the AC source at which the current will be a maximum. (b) Calculate the maximum value of the RMS current.

series RLC circuit includes a 47 Ω resistor, a 4 mH

inductor, and a 2 µF capacitor. When the frequency is 2550 Hz, what is the power factor of the circuit?

ANSWERS: 1) a) 141 V b) 20 A c) 28.3 A 2) 126 Hz 3) 160 Ω 4) 83.9 V 5) 0.819 6) a) 10.7 V b) -29.8° 7) a) 0.925 A b) 31.8° 8) a) 352 Hz

b) 15.5 A