Conceptual Physics

Chapter Assumptions

For any problems in this chapter that involve a household electrical outlet, assume that the voltage supplied is fixed at 120 V. While

this is not true for actual outlets, whose voltage varies and periodically exceeds 120 V, the simplification will not affect the accuracy
of your answer.

Answers to selected problems

Chapter 25 Answers

C.1 (a) 1

(b) 3

C.3 The current stays the same

Answers vary

C.7 Noníohmic

C.9 No

Answers vary

C.11No

Answers vary

C.13Electric energy

1.1 (a) 6.00eí2 C

(b) 3.75e17 electrons

(c) 0 protons

1.3 12.3 C

1.5 7.4e-7 A

1.7 4.2eí7 s

1.9 (a) 3.89eí2 C/m^2

(b) Down

2.1 (a) 1.1e4 s

(b) Answers vary

3.1 16.4 ȍ

3.3 4.0eí3 A

3.5 1.29 V

4.1 100 ȍ

5.1 2.4eí 7 ȍ

5.3 Aluminum

5.5 (a) 10.0 ȍ

(b) 16.0 ȍ

(c) 2.00 ȍ

6.1 360°C

6.3 (a) 0.00501°Cí^1

(b) Tungsten

6.5 16.3°C

6.7 51.8 ȍ

7.1 3.1 V

7.3 20 light bulbs

7.5 14 ȍ

7.7 (a) 2.4 ȍ

(b) 1.0e2 W

8.1 $7.17e20

11.1 2.07e10 W

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