PHYS 101 Quiz Electricity

PHYS Quiz: Electricity and Magnetism

Module 7: Week 7

1. A battery operating a large flashlight produces a current of 2 amperes in a light bulb that has a resistance of 4 ohms. The voltage of the battery is
2. A current can be made to flow in a wire if
3. The greenhouse effect is occurring because
4. The energy per unit charge supplied by a battery is its
5. Global warming
6. Two charged bodies separated by a distance d exert an electrical force on each other. The distance d is doubled. The electrical force on each body now
7. The ionosphere
8. The SI unit of electric charge is
9. An iron nail is brought near a magnet. Which of these is not true?
10. The type of EM radiation that has wavelength just a bit shorter than that of visible light is
11. Lightning is dangerous to humans because lightning strokes
12. A positive ion is formed when
13. The energy used by a 100-watt light bulb in 1 hour is
14. An electric motor on an airplane operates on 21.5 volts and draws a current of 11.0 amperes. How much energy (in joules) does the motor use during a 9.0-hour flight?
15. An object that has zero resistance is a
16. A battery operating a large flashlight produces a current of 2 amperes in a light bulb that has a resistance of 4 ohms. The voltage of the battery is 2 volts.
17. For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body’s absolute temperature: As the temperature of an object increases, the wavelength of the brightest light emitted increases.
18. Voltage can also be called potential.
19. The energy used by a 100-watt light bulb in 1 hour is 360,000 joules
20. For a body emitting blackbody radiation, the total power emitted is proportional to the 4th power of the body’s absolute temperature: A body in a room at 300 K is heated to 3,000 K. The wavelength of the most intense EM radiation emitted by the body at 3,000 K is 10 times the wavelength of the most intense EM radiation at 300 K.
21. An object that has zero resistance is a semiconductor.
22. The ozone layer absorbs infrared radiation from sunlight.
23. A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts. If two slide projectors are connected in parallel across the same 120-volt source, the current drawn from the source remains at 6 amperes.
24. In a circuit connected to a battery, the current flows from negative pole toward the positive pole of the battery.
25. Larger batteries have higher output voltages.
26. Select the closest matching pairs possible. Voltage, Changing Magnetic Field, Electromagnetic Wave, Changing Electric Field, Power
27. Write Ohm’s Law A potentiometer is a variable resistor that can be adjusted given the needs of the application. For a 24-volt circuit compute the resistance that should be set to obtain the following current levels: