Page 90 - Science Class 6 Times Publication

4. Dry cell consists of zinc vessel with carbon powder and
manganese dioxide tightly packed inside it.
5. Dynamo is used to produce small amount of current.

6. Generator is used to produce huge amount of current in
industries or factories.
7. The path through which electric current ows is called

electric circuit.

8. No current ows through open circuit whereas current  ows
through closed circuit.
9. The substances which allow current to pass through them
are called good conductors.

10. The substances which do not allow current to pass through
them are called insulators.

Exercise

1. Choose the best alternative in each case:

a. A device that changes chemical energy into electrical energy is
called

i. Battery ii. Load

iii. Cell iv. Dynamo

b. The chemical used in a simple cell is

i. Carbon ii. MnO
2
iii. CuSO iv. H SO 4
2
4
c. The chemical that is used in a dry cell

i. NH Cl ii. MnO
4
2
iii. Carbon dust iv. All of these

d. The circuit through which current is not owing is called
i. Open circuit ii. Closed circuit

iii. Mixed circuit iv. All of these

Times' Crucial Science and Environment 86 Book 6