Electromagnetic Induction Sprint Review

A device consisting of a coil that is mechanically rotated in a stationary magnetic field is called

• a transformer
• a motor
• a generator
• a dipole

A device that uses two coils around an iron core to change the voltage across a circuit is called a 

• voltmeter
• diode
• transformer
• generator

In a vacuum, electromagnetic waves travel at speeds

• greater than the speed of light.
• equal to the speed of light.
• less than the speed of light.

Step up transformers can be used to get more energy out of them than is put into them.

• Always

• Never

• Sometimes.

13.1 Electromagnetic Induction is...

• the use of the movement of magnets around a coil of wire to create an electrical current through the wire
•  the use of the movement of electricity around a coil of wire to create an electrical current through the wire

13.1 Electromagnetic induction occurs in a coil when there is a change in

• a. electric field intensity in the coil.
• b. magnetic field intensity in the coil.
• c. voltage in the coil.
• d. the coil's polarity.

13.2 How would flipping the magnet in this experiment change the current?

• The current would not change
• The current would go to the right
• There would be no current
• The current would go CRAZY

13.5 Will a transformer work with direct current (d.c.) or alternating current (a.c.)?

• a.c. only
• d.c. only
• Both a.c. and d.c.

13.9 Step-up transformers...

• improve the efficiency of the national grid
• reduce the voltage to a safe level for the home
• both 

13.9 Step-down transformers...

• improve the efficiency of the national grid
• reduce the voltage to a safe level for the home
• both