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 Electromagnetic Induction Practice Questions 2

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1 .       120 volt house current is to be transformed down to 12 volts. If the input current (RMS) is 1.5 amps then the output current is [Hint]

 .015 amps .15 amps 1.5 amps 15 amps

2 .       A transformer takes 10 volts and 5 amps and changes it to 150 volts. What is the power output of the transformer? [Hint]

 5 watts 50 watts 150 watts 1500 watts

3 .       A transformer has 150 turns on the primary and 20 on the secondary. 100 volts and 10 amps will be changed to [Hint]

 13.3 volts and 1.33 amps. 13.3 volts and 75 amps. 750 volts and 1.33 amps. 750 volts and 75 amps.

4 .       50 kW are to be transmitted over wires with a resistance of 1.8 ohms at 300 volts. What is the power loss in the wires? [Hint]

 50 kW 5 kW 5 W 0 W

5 .       50 kW are to be transmitted over wires with a resistance of 1.8 ohms at 30000 volts. What is the power loss in the wires? [Hint]

 50 kW 5 kW 5 W 0 W

6 .
The above figure represents an electromagnetic wave frozen in time. The blue line is the [Hint]

 frequency. wavelength. period.

7 .       If the wavelength of the wave in the above question is 3x10-5m the wave is [Hint]

 a radio wave. a microwave. an infrared wave. visible light wave. UV wave. X-ray.

8 .       If the wavelength of the wave in question 6 is 3 nm the wave is [Hint]

 a radio wave. a microwave. an infrared wave. visible light wave. UV wave. X-ray.

9 .       If the wavelength of the wave in question 6 is 0.6 microns the wave is [Hint]

 a radio wave. a microwave. an infrared wave. visible light wave. UV wave. X-ray.

10 .       If the wavelength of the wave in question 6 is 10 km the wave is [Hint]

 a radio wave. a microwave. an infrared wave. visible light wave. UV wave. X-ray.

11 .
In the figure an electromagnetic wave is shown moving left to right. If the number in the upper right is the time measured in units of 100ps the wave is a
[Hint]

 a radio wave. a microwave. visible light wave. UV wave. X-ray.

12 .       What is the wavelength of wave in question 11? [Hint]

 1 cm. 1 meter. 4 meters. 15 meters. 1 km.

13 .       If the time counter in question 11 is clicking time in units of 0.2fs the wave is [Hint]

 a radio wave. a microwave. an infrared wave. visible light wave. X-ray. None of the above

14 .       The wavelength of the wave in question 13 is [Hint]

 10 m. 1.5 mm. .4 microns. 6x10-10 m.

15 .       If the counter in question 13 is counting in seconds the wave is [Hint]

 a radio wave. a microwave. an infrared wave. UV wave. none of the above

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