F2 IS QZ 11 anwers

1st Term QZ 11 Submission date：_____________ Name：______________________ Class & no.：2 _________(     )

8.4

Word Translation (7 marks)

i    Write down the English terms of the following Chinese terms:

	Chinese term	English term
1	銅	Copper
2	鎳鉻	Nichrome
3	電阻	Resistance
4	歐姆	Ohm
5	電阻	Resistance
6	滑動型變阻器	Sliding rheostat
7	旋轉式變阻器	Rotary-type rheostat

Fill in the Blanks (26 marks)

1     Resistance (1) of a conductor measures its opposition to the flow of electric current.

2     Copper wire conducts electricity better (1) than that of nichrome. This is because copper has a smaller opposition to the flow of electric current / free electrons (1)

than nichrome. That is, copper has a lower resistance (1) than nichrome.

3     The unit of resistance is ohm (1). Its symbol is W (1).

4     For the same voltage applied, the electric current flowing through a circuit will be larger (1) if the resistance is lower.

5     The resistance of a wire depends on its material (1), thickness (1) and length. For wire with the same length and thickness, a nichrome (1) wire has a higher resistance than a copper(1) wire.

For wires made of the same material and with the same length, a thinner (1) wire has a higher resistance.

For wires made of the same material and with the same thickness, a longer wire has a higher (1) resistance.

6     Resistors (1) are used to control the size of the electric current flowing through a circuit with a fixed value of resistance. A larger electric current can be obtained in a circuit by using one with a lower (1) value of resistance.

7     A rheostat (1) can also be used to control the size of an electric current flowing through a circuit because its resistance is variable (1). Two common types used in the laboratory are as follows: