Question

If
the diameter of a copper wire is 9.52 mm, find the resistance of a
20.00 km length of copper wire (such wire used for power
transmission).

The resistivity of the copper is 1.72 x 10^-8 Ohm meter

Answer #1

Resistance R = ( L / A )

where is resistivity, L is length and A is cross section area

R = (1.72
10^{-8}
20
10^{3} ) / ( 0.25
9.529.52
10^{-6} ) = 4.833

Find the ratio of the diameter of aluminum to copper wire, if
they have the same resistance per unit length (as they might in
household wiring). The resistivity of Aluminum is 2.65 x
10-8 Ω m ; the resistivity of copper is 1.72 x
10-8 Ω m.

A 2 m long gauge 14 copper wire (diameter 1.624 mm, resistivity
1.72 × 10-8 Ωm) replaces a similar 2 m long copper wire but of
gauge 20 (diameter 0.812 mm). The resistance of the new wire is
then that of the original wire.

#4. A copper wire is 250 m long and it has a diameter of 0.225 mm.
The resistivity of copper is 1.7 x 10-8 -m. A battery of
negligible internal resistance and emf of 35.0 v is connected
across this wire.
a) Find the resistance of the wire.
b) Find the current through the wire.

A wire consists of a steel center, 1mm in diameter, and a copper
sheathing that is 2 mm in diameter (with a 1 mm inner diameter
where the copper is fused to the steel). What is the resistance of
a 10 meter-long piece of this wire, and how much current and how
much power is dissipated in this wire if attached across the
terminals of a 12-volt battery? Hint: are the copper and steel
components of the wire in series...

Copper has 8.5 x10^28 electrons per m^3 . A 71 cm length of
copper wire of diameter 2.05 mm carries 4.85A of current. ( For
copper: ρ = 1.72 x 10^-8 ohm-m) a. How much time does it take an
electron to travel the length of the wire ? b. Find the electric
field inside the wire. c. What is the resistance of this wire?

Problem 3: Suppose you have a
pocket calculator that draws a current of 0.21 mA from its 1.05-V
battery. Calculate the effective resistance of the
pocket calculator, in kilohms.
R=_______
Problem 4: The diameter of a
specific copper wire is 8.11 mm, and has a resistivity of 1.72 ×
10-8 Ω⋅m. Find the resistance of a 1.2 km length of such
wire used for power transmission in Ω.
R=_______

Calculate the ratio of the resistance of 14.0 m of aluminum wire
1.5 mm in diameter, to 28.0 m of copper wire 2.9 mm in diameter.
Assume electrical resistivity of aluminum is 2.65×10−8 Ω⋅m and
electrical resistivity of copper is 1.68×10−8 Ω⋅m.

1.
A 10.0 m length of wire consists of 5.0 m of copper, followed by
5.0 m of aluminum. Both have a diameter of 1.4 mm. A potential
difference of 95 mV is placed across the composite wire.
*Note* the resistivity of copper is 1.68 x 10
-8 Ohm * m and the resistivity of aluminum is
2.65 x 10 -8 Ohm * m
A. (worth 10 points) What is the equivalent
Resistance of the composite wire?
B. (worth 5 points) What...

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...

There is a wire made of copper with a diameter of 3.26 mm. A
current of 20.0 A was applied to this wire.
Answer the following question assuming that the electron density of
copper is n = 8.47 × 1028 m-3.
(1) Find the current density.
(2) Find the electron drift velocity.
(3) When the resistivity of copper is 1.70 × 10-8 Ω·m, find the
voltage drop that occurs along the length of this wire.
(4) Find the electron mobility.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 21 minutes ago

asked 24 minutes ago

asked 28 minutes ago

asked 51 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago