CK-12 Physical Science Concepts - For Middle School

http://www.ck12.org Chapter 5. Energy

• direct current (DC): Electric current that flows only in one direction.

Explore More

At the following URL, watch the video comparing direct and alternating current. Then answer the questions below.
http://www.diffen.com/difference/Alternating_Current_vs_Direct_Current

1. Current from a battery is __ current.


2. Current from a power plant is __ current.


3. In the U.S., alternating current reverses direction at a rate of __ hertz.


4. What is the advantage of producing and using alternating current?


5. How can a device, such as a computer, that needs direct current use alternating current from a wall outlet?

Review

1. Compare and contrast direct and alternating current.