Question

A
2-wire d.c. distributor, 500 m long is fed at one of its ends. The
cross-sectional area of each conductor is 34 cm^2 and the
resistivity of copper is 1.7x10^-6 Ohm cm. The distributor supplies
200 A at a distance of 300m from the feeding point and 100 A at the
terminus. Calculate the voltage at the feeding end if the voltage
at the terminus is to be 230 V.

Answer #1

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A 2-wire d.c. distributor AB is fed at both ends at the same
voltage of 230 V. The length of the distributor is 500 meters and
the loads are tapped off from the end A as shown below:
Load: 100 A 60 A 40 A 100 A
Distance: 50 m 150 m 250 m 400 m
If the maximum voltage drop of 5.5 V is to be allowed, find
the X-sectional area of each conductor and point of minimum
potential....

A 2 wire d.c distributor is 200m long. Distributor fed from both
ends. At the feeding point A, the voltage is maintained as at 230V
and at B 235V. The loads are tapped off as under, 25A at a point
50m from A: 50A at 75m from A: 30A at 100m from A; 40A at 150m from
A, calculate the minimum voltage on the distributor. Resistance per
kilometer of one conductor is 0.3 ohms. Also calculate the power
dissipated in...

A copper wire is 8.00 m long, and has a
cross-sectional area of 1.00 × 10–4 m2. This wire forms a 1turn
loop in the shape of a square and is then connected to a battery
that applies a potential difference of 0.100 V. If the loop is
placed in a uniform magnetic field of magnitude 0.400 T, what is
the maximum torque that can act on it? The resistivity of copper is
1.70 × 10–8 Ω · m. Define...

A copper wire is 8.00 m long, and has a cross-sectional area of
1.00 × 10-4 m2. This wire forms a 1turn loop
in the shape of a square and is then connected to a battery that
applies a potential difference of 0.100 V. If the loop is placed in
a uniform magnetic field of magnitude 0.400 T, what is the maximum
torque that can act on it? The resistivity of copper is 1.70 ×
10-8 Ω • m. Define...

A
copper wire of cross sectional area A=1.7 mm2 and Lenght L=1 m
carries a current of I=6.4 A at the temperature of T1= 20 0C. a)
How many electrons pass through a cross section of the wire in each
second? b) What is the resistance of the wire ? c) What is the
potential difference between the ends of the wire? d) What is the
resistance of the wire at the temperature of T2= 100 0C?
(r=1.7x10-8 W.m, a=7x10-3...

A copper wire 100m long with cross-sectional area of 2x10^-4
cm^2 is heated from room temperature of 25 C to 200 C. Find
a) The initial resistance of wire
b) The increase in resistance from 25 to 200 C
c) The drift speed of the “electron group” in the wire, if the
current is 3A and density of
electrons is 8.5x10^28 electrons /m 3
d) The voltage drop across the wire resistor for this current of
3A
e) The power...

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