PHY_10_65_V2_DM_Electromagnetic devices

Worksheet

Electricity Magnetism Test Review

Modified True/False Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.

1. A conductor is a material that doesn't allow electrons to flow through it easily. _________________________

2. A lightning bolt occurs when billions of protons are transferred at the same time. _________________________

3. The rearrangement of electrons on a neutral object caused by a nearby charged object is called charging by induction. _________________________

4. Voltage difference is measured in amperes. _________________________

5. The unit used to measure current is the volt. _________________________

Multiple Choice Identify the choice that best completes the statement or answers the question.

6. Which of the following is a device designed to open an overloaded circuit and prevent overheating?

circuit breaker

magnet

resistor

transformer

7. Current that does NOT reverse direction is called ____.

alternating current

circuit current

direct current

magnetic current

8. The location of the strongest magnetic forces is the ____.

electromagnets

magnetic domains

magnetic fields

magnetic poles

9. Current that reverses direction in a regular pattern is called ____.

alternating current

circuit current

direct current

magnetic current

10. The region around a magnet where the magnetic forces act is the ____.

electromagnetic pole

magnetic domain

magnetic field

magnetic pole

11. Objects that keep their magnetic properties for a long time are called ____.

electromagnets

magnetic domains

permanent magnets

temporary magnets

12. The function of an electric motor is to change ____.

a.	chemical energy to electrical energy	c.	electrical energy to mechanical energy
b.	electrical energy to chemical energy	d.	mechanical energy to electrical energy

13. The function of a generator is to change ____.

a.	chemical energy to electrical energy	c.	electrical energy to mechanical energy
b.	electrical energy to chemical energy	d.	mechanical energy to electrical energy

14. The current that flows in an electric circuit carries ____.

chemical energy

mechanical energy

thermal energy

electrical energy

15. There is a repulsive force between two charged objects when

a.	charges are of unlike sign.	c.	charges are of like sign.
b.	they have the same number of protons.	d.	they have the same number of electrons.

16. There is an attractive force between two charged objects when

a.	charges are of unlike sign.	c.	charges are of like sign.
b.	they have the same number of protons.	d.	they have the same number of electrons.

17. Which of the compass needle orientations in the figure above might correctly describe the magnet’s field at that point?

Matching

Match each term with the correct statement below.

a.	conductor	d.	fuse
b.	insulator	e.	electroscope
c.	circuit breaker

____ 18. contains a piece of metal that melts if the current becomes too high

____ 19. allows electrons to move through it easily

____ 20. contains a piece of metal that bends when it gets hot

____ 21. detects the presence of electric charges

____ 22. does not allow electrons to move through it easily

Completion Complete each statement.

Figure 7-1

23. In Figure 7-1, circuit ____________________ is wired in series.

24. In Figure 7-1, circuit ____________________ is wired in parallel.

25. In Figure 7-1, circuit ____________________ represents the way that homes are usually wired.

26. In Figure 7-1, circuit ____________________ is the type of circuit that causes an entire string of decorative lights to go out when one of the bulbs burns out.

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Worksheet Electricity Magnetism

The function of a generator is to change ____

Completion Complete each statement

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