A piece of iron rebar on a construction site measures 2 cm in diameter and is 3m long. What electrical resistance do you expect this to have? The electrical conductivity of rebar is 1.0299x10² Q-¹m-¹ A. 9.27 x 10-4 Ω B. 7.87 x 10-3 C. 8.65 x 10-²0 D. 1.13 x 10-¹ Below is a chart showing how a real battery voltage changes in time. How much current flows through a 1 k resistor when the battery has been discharging for 120 minutes? (Pick the closest approximation.) 13V- 12V- 1.1V- midpoint voltage (1.18 Vets) end of discharge (127 minutes Cell Voltage (Volts) NH 0.9V- 60 120 Time (minutes) Figure 2. Single Cell 300mA Discharge Curve. A. 1.1 MA B. 3.0 mA C. 0.75 mA D. 0.50 mA 140

A piece of iron rebar on a construction site measures 2 cm in diameter and is 3m long. What electrical resistance do you expect this to have? The electrical conductivity of rebar is 1.0299x10² Q-¹m-¹ A. 9.27 x 10-4 Ω B. 7.87 x 10-3 C. 8.65 x 10-²0 D. 1.13 x 10-¹ Below is a chart showing how a real battery voltage changes in time. How much current flows through a 1 k resistor when the battery has been discharging for 120 minutes? (Pick the closest approximation.) 13V- 12V- 1.1V- midpoint voltage (1.18 Vets) end of discharge (127 minutes Cell Voltage (Volts) NH 0.9V- 60 120 Time (minutes) Figure 2. Single Cell 300mA Discharge Curve. A. 1.1 MA B. 3.0 mA C. 0.75 mA D. 0.50 mA 140

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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Concept explainers

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.

Question

A piece of iron rebar on a construction site measures 2 cm in
diameter and is 3m long. What electrical resistance do you expect
this to have? The electrical conductivity of rebar is 1.0299x107
Ω=1m=1
A. 9.27 x 10-4 Ω
B. 7.87 x 10-³ Q
C. 8.65 x 10-²
D. 1.13 x 10-¹ Q
Below is a chart showing how a real battery voltage changes in time.
How much current flows through a 1 k resistor when the battery has
been discharging for 120 minutes? (Pick the closest approximation.)
1.3V-
12V-
1.1V-
midpoint voltage
(1.18 Valts)
1.0V-
end of discharge
(127 minutes)
0.9V-
40
60
60
100
120
Time (minutes)
Figure 2. Single Cell 300mA Discharge Curve.
A.
1.1 mA
B. 3.0 mA
C. 0.75 mA
D. 0.50 mA
Cell Voltage (Volts)
140

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