14
formation. Decide on the part of speech for each of the word and give their
meaning
Table 1
Word
Suffix/Prefix Part of speech
Meaning
conductor
-or
a noun
a substance that conducts
electricity or heat
Correlate alternating and direct current concepts to their
characteristics
1.
A current moving steadily in one direction. = DC
2.
It is used in telephones, electrical systems of airplanes, automobiles.
3.
It is associated with batteries.
4.
It is used in lighting, heating, cooling.
5.
A current moving first in one direction and then in another.
6.
It supplies the greatest part of the electric power for industry.
7.
It is used in asynchronous motors.
8.
It is used to meet the industrial requirements.
9.
It is increasing or decreasing with little energy loss.
The text in mind, say whether these sentences are true or false
1.
The symbol for current is I.
2.
The electric current can flow only through liquids.
3.
The current can be of two types: direct current and alternating current.
4.
The alternating current flows in one direction.
5.
A battery is the simplest source of power for the direct current.
6.
Direct current finds wider application than alternating current.
7.
Electrolytes don’t change greatly when current passes through them.
8.
One of the great advantages of alternating current is the ease with
which voltage can be changed.
Read the text again and answer the questions in writing
1.
How do like/unlike charges behave?
2.
What happens when some external forces start acting on charged
particles within the material?
