1. In household wiring, usually 12-gauge copper wire (diameter 2.05 mm) is used. A light bulb is connected to power supply through such a wire. A 1.5-Ampere current runs through the wire and the light bulb. What is the resistance of 10-meter length of а. the wire? b. How many electrons pass through the light bulb each second? с. What is the current density in the wire?
1. In household wiring, usually 12-gauge copper wire (diameter 2.05 mm) is used. A light bulb is connected to power supply through such a wire. A 1.5-Ampere current runs through the wire and the light bulb. What is the resistance of 10-meter length of а. the wire? b. How many electrons pass through the light bulb each second? с. What is the current density in the wire?
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Please help answer parts A. B. and C.

Transcribed Image Text:1.
In household wiring, usually 12-gauge copper
wire (diameter 2.05 mm) is used. A light
bulb is connected to power supply through such a wire. A
1.5-Ampere current runs through the
wire and the light bulb.
а.
What is the resistance of 10-meter length of
the wire?
b.
How many electrons pass through the light
bulb each second?
c.
What is the current density in the wire?
ww . p
Substance
p (fN • m)
P (0.
p (fN •m)
Substance
Conductors
Semiconductors
1.47 x 10*
1.72 x 10
2.44 X 108
2.75 x 10
5.25 X 10
20 x 10
22 x 10-8
95 x 10
44 X 108
49 x 108
100 x 10
Pure carbon (graphite)
Pure germanium
Pure silicon
Metals
Silver
3.5 x 10-3
Соррer
Gold
Aluminum
0.60
2300
Insulators
5x 104
100-104
>1013
10"-1015
75 x 1016
1015
Tungsten
Steel
Amber
Glass
Lucite
Mica
Lead
Mercury
Manganin (Cu 84%, Mn 12%, Ni 4%)
Constantan (Cu 60%, Ni 40%)
Nichrome
Alloys
Quartz (fused)
Sulfur
Teflon
Wood
10- 10
TABLE 31-2. Values of the Resistivity and the Temperature Coefficient
for Various Substances
SUBSTANCE
e (2- m)
a (deg-)
p (at 0° C)
a (0° C-100° C)
Conductors:
(Ag
Cu
AI
1.47 x 10-
1.56 x 10
2.63 x 10-
6.38 x 10
8.85 x 10-
9.83 x 10
4.8 x 10-7
4.9 x 10-7
1.1 x 10
4.1 x 10-3
4.3 x 10-3
4.4 x 10-3
6.6 x 10
6.5 x 10-3
3.9 x 10-3
2 x 10-5
-1 x 10-5
4 x 10-
metals
Ni
Fe
Pt
Manganin
alloys Constantan
Nichrome
Semiconductors:
p (at 20° C)
a (at 20° C)
C
Ge
Si
3.5 x 10 5
0.45
-5 x 10 3
-4.8 x 10-2
-7.5 x 10-2
pure
640
p (at 20° C)
5 x 1014
1010-1014
>1013
7.5 x 1017
1015
10-101
Insulators:
Amber
Glass
Lucite
Quartz
Sulfur
Wood
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