F2 IS WS12 Answers

1st Term WS 12 Submission date：_____________ Name：______________________ Class & no.：2 _________(     )

8.1       Making electricity flow

i      Words to know:

	English term	Write the words again	Chinese term
1	Electricity		電 / 電力
2	Electrical energy		電能
3	Dry cell		乾電池
4	Closed circuit		閉合電路
5	Open circuit		斷路
6	Electrical conductors		導電體
7	Electrical insulators		電絕緣體
8	Switch		開關
9	Metal / Non-metal		金屬 / 非金屬
10	Graphite		石墨

i      Fill in the blanks:

1          Conditions for electricity to flow:

Ø  Sources of electrical energy:

l Dry cell stores chemical energy which can be converted into electrical energy.

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

Ø  A path for electricity to flow through called circuit

l A circuit which is complete is called a closed circuit.

l A circuit which is incomplete is called an open circuit.

         

2       Materials that allow electricity to pass through are called electrical conductors.

          Materials that do not allow electricity to pass through are called electrical insulators.

3       Metals are electrical conductors while most non-metals are electrical insulators.

         Graphite is a non-metal but it conducts electricity.

4       A switch can be used to open or close a circuit.

i      Concept checking:

Decide whether the following statements are true or false, and try to rewrite the true statements.

1        If a circuit is open, an electric current can flow through it.                                   True / False

If a circuit is open, electric current cannot flow through it.

/ If a circuit is closed, an electric current can flow through it.

2        Graphite is a non-metal, so it cannot conduct electricity.                                       True / False

Graphite is a non-metal, but it can conduct electricity.