Your Textbook EditionPricingAbout UsFeaturesReviewsFAQContact
Get startedLog in
Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Edition
18
Electric Currents
Change chapter
18-2 and 18-3: Electric Current, Resistance, Ohm's Law
1
play arrow0:37
2
play arrow0:37
3
play arrow0:59
4
play arrow0:29
5
play arrow0:18
6
play arrow0:52
7
play arrow1:03
8
play arrow1:33
9
play arrow0:43
10
play arrow0:43
11
play arrow1:37
18-4: Resistivity
12
play arrow1:14
13
play arrow0:57
14
play arrow1:30
15
play arrow2:16
16
play arrow0:57
17
play arrow1:16
18
play arrow1:54
19
play arrow3:33
20
play arrow1:50
21
play arrow2:14
22
play arrow3:20
23
play arrow2:24
24
play arrow4:24
25
play arrow6:03
26
play arrow2:50
18-5 and 18-6: Electric Power
27
play arrow0:21
28
play arrow0:39
29
play arrow0:40
30
play arrow1:09
31
play arrow1:25
32
play arrow0:27
33
play arrow1:05
34
play arrow1:18
35
play arrow0:49
36
play arrow1:21
37
play arrow1:42
38
play arrow1:40
39
play arrow0:58
40
play arrow1:47
41
play arrow0:57
42
play arrow1:44
43
play arrow2:36
44
play arrow4:21
45
play arrow3:08
46
play arrow2:17
18-7: Alternating Current
47
play arrow0:54
48
play arrow0:33
49
play arrow0:53
50
play arrow1:04
51
play arrow1:07
52
play arrow1:03
53
play arrow1:49
54
play arrow1:59
18-8: Microscopic View of Electric Current
55
play arrow3:41
56
play arrow2:04
57
play arrow2:34
18-10: Nerve Conduction
58
play arrow0:35
59
play arrow2:04
60
play arrow3:06
Question by Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014, Reprinted by permission of Pearson Education Inc., New York.
Problem 9
Q

A hair dryer draws 13.5 A when plugged into a 120-V line.

  1. What is its resistance?
  2. How much charge passes through it in 15 min? (Assume direct current.)
A
  1. 8.9  Ω8.9 \; \Omega
  2. 1.2×104 C1.2 \times 10^4 \textrm{ C}
Giancoli 7th Edition, Chapter 18, Problem 9 solution video poster
Padlock

In order to watch this solution you need to have a subscription.

Get Started
View sample solution

|

Log in
VIDEO TRANSCRIPT

This is Giancoli Answers with Mr. Dychko. Resistance is voltage divided by current. So this hair dryer, when it's plugged into 120 volts and it draws 13.5 amps, take the quotient of those and you get 8.9 ohms, it must be the resistance. Knowing the current is the amount of charge that passes at a hair dryer per time, we can multiply both sides by t, and get that the amount of charge equals the current multiplied by time. It's 13.5 amps and multiplied by the time in seconds. So 15 minutes times 60 seconds per minute, and this gives us 1. 2 times 10 the 4 Coulombs of charge.

Privacy policyTerms of serviceHelp center

Find us on:

Facebook iconTrustpilot icon
Giancoli Answers, including solutions and videos, is copyright © 2009-2024 Shaun Dychko, Vancouver, BC, Canada. Giancoli Answers is not affiliated with the textbook publisher. Book covers, titles, and author names appear for reference purposes only and are the property of their respective owners. Giancoli Answers is your best source for the 7th and 6th edition Giancoli physics solutions.