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