Question 1

A heater is plugged into the same 120-V AC outlet as an 800-W hair dryer.If the total rms current drawn is 16.7 A,then calculate the power rating of the heater.

Accepted Answer

A) 2000 W 
B) 800 W 
C) 3200 W 
D) 1200 W 
E) 2800 W 
A) 2000 W 
B) 800 W 
C) 3200 W 
D) 1200 W 
E) 2800 W

Question 2

A square coil with 12 turns and side 5 cm is rotated in a uniform magnetic field of 1.2 T at an angular frequency of 90 radians per second.What is the maximum voltage induced in the coil?

Accepted Answer

A) 10 V 
B) 3.2 V 
C) 0.51 V 
D) 0.27 V 
E) none of the above 
A) 10 V 
B) 3.2 V 
C) 0.51 V 
D) 0.27 V 
E) none of the above

Question 3

In the U.K.the power companies supply an rms voltage of 240 V to most home outlets.If you were to try and use your standard U.S.rated 1200-W (at 120-V)hair dryer in the U.K.without using a transformer,what would be the average power supplied to the hair dryer?

Accepted Answer

A) 1200 W 
B) 2400 W 
C) 4800 W 
D) 600 W 
E) None of the above 
A) 1200 W 
B) 2400 W 
C) 4800 W 
D) 600 W 
E) None of the above

Question 4

Use the following figure for the next problem.  
-The figure shows the voltage and current for a device.The average power consumed by the device is

Accepted Answer

A) 2 W 
B) 0.6 W 
C) 1.2 W 
D) 0.3 W 
E) 2.4 W 
A) 2 W 
B) 0.6 W 
C) 1.2 W 
D) 0.3 W 
E) 2.4 W

Question 5

Use the following figure for the next problem.  
An AC power supply, V = 20 V sin   where   = 200 rad/s is connect to an inductor L = 180 mH and a capacitor C = 25   XL = 36 ohms, XC = 200 ohms, Z = 43.9 ohms
-What is the peak current flow through the inductor?

Accepted Answer

A) 0.56 A 
B) 0.46 A 
C) 0.10 A 
D) 85 mA 
E) None of these is correct. 
A) 0.56 A 
B) 0.46 A 
C) 0.10 A 
D) 85 mA 
E) None of these is correct.

Question 6

A flat,rectangular coil measuring 0.10 m by 0.20 m and containing 50 turns of wire is rotating at a constant speed of 100$\pi$ rad/s in a magnetic field of 0.20 T.The maximum EMF induced in this coil is approximately

Accepted Answer

A) 1.0 V 
B) 10 V 
C) 63 V 
D) 44 V 
E) 0.13 V 
A) 1.0 V 
B) 10 V 
C) 63 V 
D) 44 V 
E) 0.13 V

Exam 29: Alternating-Current Circuits

A heater is plugged into the same 120-V AC outlet as an 800-W hair dryer.If the total rms current drawn is 16.7 A,then calculate the power rating of the heater.

A square coil with 12 turns and side 5 cm is rotated in a uniform magnetic field of 1.2 T at an angular frequency of 90 radians per second.What is the maximum voltage induced in the coil?

In the U.K.the power companies supply an rms voltage of 240 V to most home outlets.If you were to try and use your standard U.S.rated 1200-W (at 120-V)hair dryer in the U.K.without using a transformer,what would be the average power supplied to the hair dryer?

Use the following figure for the next problem. -The figure shows the voltage and current for a device.The average power consumed by the device is

Use the following figure for the next problem. An AC power supply, V = 20 V sin where = 200 rad/s is connect to an inductor L = 180 mH and a capacitor C = 25 XL = 36 ohms, XC = 200 ohms, Z = 43.9 ohms -What is the peak current flow through the inductor?

A flat,rectangular coil measuring 0.10 m by 0.20 m and containing 50 turns of wire is rotating at a constant speed of 100 π\piπ rad/s in a magnetic field of 0.20 T.The maximum EMF induced in this coil is approximately

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A flat,rectangular coil measuring 0.10 m by 0.20 m and containing 50 turns of wire is rotating at a constant speed of 100 $\pi$ rad/s in a magnetic field of 0.20 T.The maximum EMF induced in this coil is approximately