Electricity and Magnetism Quiz

_____ is an electric current that reverses direction in a regular pattern.

• DC

• AC

• analog

• digital

A(n) ______ is a conducting metal ring in a motor or generator that is split.

• solenoid

• electromagnet

• commutator

• fuse

A(n) ___ signal is formed when there is a continuous change of voltage in a circuit.

• AC

• digital

• DC

• analog

A(n) ______ signal is an electric current used to encode information.

• analog

• electromagnetic

• electronic

• digital

According to Coulomb’s law, when charge decreases, force ___, and when distance decreases, force ___.

• decreases; decreases

• increases; decreases

• increases; increases

• decreases; increases

A(n) ______ is a thin, coiled wire that is tightly wrapped around a metallic core.

• commutator

• solenoid

• turbine

• electromagnet

A(n) ____ is a solid crystal material that is able to conduct electricity.

• electromagnet

• MRI

• semicrystal

• semiconductor

The difference in charge between two points is called ______.

• induction

• voltage

• wattage

• power

Where is the magnetic force weaker?

• B

• A

Select the best answer. What happens to signals when using a cell phone?

• Cell phones only use analog signals.

• Signals are repeatedly converted from analog to digital and from digital to analog.

• Cell phones only use digital signals.