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Science: Chapter 5-4 (20-4)
What are two kinds of electric current?
8
Science
6th Grade
05/21/2008

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Term

What term means:

flow of electric charge through a conductor?

Definition
electric current
Term

What term means:

current in which electrons always flow in the same direction?

Definition
direct current
Term

What term means:

current in which electrons constantly change direction at a regular rate?

Definition
alternating current
Term
What is needed in order for electricity to be useful?
Definition

the electric charge must flow steadily

(So, static electricity cannot be used.)

Term
What kind of current is produced by electrochemical cells?
Definition
direct currect (DC)
Term
What kind of current is used for most appliances?
Definition
alternating currect (AC)
Term
What are the advantages of AC?
Definition
  1. can be transported easlily over long distances
  2. voltage can be increased or decreased
  3. can be changed into direct current by converters
Term
What kind of current is used for computers, TVs, CD players?
Definition
direct currect (DC)
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