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:

Workbook Answers Chapter 8

Section 8.1 (P.51)

A. Concept checking

1.          False

2.          True

3.          False

4.          True

5.          True

B. Multiple choice

1.     (a)    electrical conductors

(b)    electrical insulators

2.     (a)    closed

        (b)    open

C. Question

1.     (a)    electrical insulator

(b)    electrical conductor

(c)    electrical insulator

(d)   electrical conductor

(e)    electrical insulator

(f)    electrical insulator

(g)    electrical insulator

(h)    electrical conductor

(i)     electrical conductor

2.

3.     (a)    (i)     will not

                (ii)    do not form

        (b)    (i)     will

                (ii)    form a closed circuit

        (c)    (i)     will

                (ii)    the bulb, the dry cells and the wires form a closed circuit

        (d)   (i)     will not

                (ii)    electrical energy in the circuit

4.     No. The wheels of the tram are connected with the power supply through the rails, and the circuit is complete. (or other reasonable answers)

Section 8.2 & 8.3 (P.54)

A. Multiple choice

1.     (a)    ampere

        (b)    volt

2.     free electrons

3.     1.5

4.     (a)    ammeter

        (b)    voltmeter

5.     larger

B. Question

1.     (a)    dry cell

(b)    wire

(c)    free electrons

Section 8.5
A. Multiple choice p.60-61
1. D
2. C
3. B
4. C

B. Question p.61-62
1.
(a) dry cell
(b) battery
(c) bulb
(d) ammeter
(e) voltmeter
(f) resistor
(g) rheostat
(h) switch

Integrated Exercise
A. Concept checking p.79
1. False
2. True
3. False
4. False
5. True
6. True

B. Multiple choice p.80-83

1. B

2. D

3. B

4. C

5. B

6. D

7. D

8. C

9. B

Quick Review
1. Electric current, voltage and resistance p.90
(a) open
(b) closed
(c) voltage
(d) larger
(e) resistance
(f) smaller
(g) current
(h) brighter

2. Ammeter, rheostat and fuse p.90
(a) rheostat
(b) resistance
(g) (electric) current
(h) black
(i) positive

F2 IS QZ 10 anwers

1st Term QZ 10 Submission date：_____________ Name：______________________ Class & no.：2 _________(     )

8.2 – 8.3

Word Translation (13 marks)

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

	Chinese term	English term
1	原子	Atom
2	原子核	Nucleus
3	自由電子	Free electron
4	隨機地	Randomly
5	正極	Positive pole
6	負極	Negative pole
7	電流	Electric current
8	安培計	Ammeter
9	安培 (A)	Ampere
10	電壓	Voltage
11	伏特 (V)	Volt
12	千伏特 (kV)	Kilovolt
13	伏特計	Voltmeter

Fill in the Blanks (19 marks)

1     Matter is made up of atoms (1), each of which consists of a positively charged nucleus (1) surrounded by negatively charged electrons (1).

2     Metals are conductors because the electrons inside can free to move around randomly (1).   This kind of electron is called free electrons (1).

3     When a closed circuit is connected to a dry cell, the free electrons are driven to flow in the same (1) direction. They flow from the negative (1) pole of the dry cell to the positive (1) pole. The flow of these electrons form an electric current (1).

4     The size of electric current can be measured by an instrument called ammeter (1)   and it is measured in ampere (1) (A). The correct way to use this instrument is that the positive / red (1) terminal should be connected towards the positive pole of the dry cell and the black terminal towards the negative (1) pole.

5     Voltage (1) of a dry cell is the “push” of free electrons to flow through the circuit and can be measured by a voltmeter (1). It is measured in volt (1) (V) and smaller unit in millivolt (1) (mV).

6     When more dry cells are connected in the same direction, the total voltage is higher (1), and the size of the electric current flowing through is larger (1), provided that other conditions are the same.