Question

**A 2.36-mm diameter copper wire (resistivity 1.68 ×
10 ^{-8}Ω∙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** is connected in
series with an external resistor 176.0 **ohms**. What
is the terminal voltage, in **volts**, of the
battery?

Answer #1

PLEASE SHOW ALL WORK!
00-gauge copper wire has a diameter of 9.266 mm and a
resistivity of 1.68 × 10−8 Ω · m at 20.0◦C. The wire is 1.00m in
length.
a) What is the power loss in the wire if the wire carries 110.
A?
b) The temperature coefficient of resistivity for copper is α =
3.90 × 10−3 ◦C−1. If the copper is at 40.0◦C, what is its new
resistivity?
c) If it still has the same power...

An insulated copper wire with a length of 1.2 m carries 20 A of
current. The copper is 1 mm in diameter and the insulation (k=0.13
W/m. ºC) has a thickness of 0.8 cm. The wire has electrical
resistance of 0.0321 Ω. Air at 25 ºC blows in crossflow over the
wire to produce an external convective heat transfer coefficient of
219 W/m2. K. Assuming the copper is isothermal, find the copper
temperature. Take the electrical resistivity of copper to...

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)...

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