Worksheet 8.1 answers

II.   Fill in the blanks:

1.     Conditions for electricity to flow

Ø   Sources of electrical energy:

²  Dry cell stores (1)chemical energy which can be converted into electrical energy;

²  Electrical energy can also be supplied from the power station to the appliance through the socket.

Ø   A path for electricity to flow through is called a (2) circuit.

²  A circuit which is complete is called a (3) closed circuit.

²  A circuit which is incomplete is called an (4) open circuit.

2.         Electrical conductors and insulators

Ø   Materials that allow electricity to pass through are called electrical (5)conductors.

Ø   Materials that do not allow electricity to pass through are called(6) insulators.

Ø   (7)Metals are electrical conductors while most (8)non-metals are electrical insulators.

3.     Switches

We use a (9)  switch to open or close a circuit.