Question

1. Consider a wire with resistivity of (1.20+A)x10^{-7}
Ω m, a diameter of (1.50+B) mm, and a length of (15.0+C) m.
Determine the resistance of the wire in ohms (Ω). Round your answer
to three significant figures.

A = 8 B = 1 C = 12

2. An (11.4 + A) ohm device is connected to a 115 V outlet. If the cost of the electrical energy is $0.16/kWh, determine the cost of running this device for (36.0 + B) hours. Round your answer in dollars ($) with 2 decimal places.

A = 18 B = 12

Answer #1

A 2.36-mm diameter copper wire (resistivity 1.68 ×
10-8Ω∙m) carries a current of 15.6 A. What is the
potential difference (in volts) between two points 194 m
apart?
A carbon resistor has a resistance of 19.17 Ω at a
temperature of 21.1 °C. At what temperature (in °C) its resistance
will drop to 12.93 Ω? (The temperature coefficient of resistivity
for carbon is -5.0 ×
10-4/C°.)
A battery with an emf of 5.87 volts and an
internal resistance 2.47 ohms...

A 3.00 m long copper wire has a 1.20 m long section with a 1.60
mm diameter and a 1.80 m long section with a 0.80 mm diameter. The
electric current is 2.5 mA (milli Amps) in the 1.60 mm diameter
section. The electrical resistivity of copper is 1.68 x 10^-8 Ω
m.
a) (10pts) What is the current density in the 1.60 mm diameter
section?
b) (10pts) What is the magnitude of the electric field in N / C...

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