What current I is needed to transmit 125 MW of power over a transmission line held at a voltage of 25.0 kV? I = Find the power loss Ploss that would occur in the transmission line if a 1.35 2 line is used to transmit 125 MW of power. Ploss = What percent loss does this represent? percent loss: A W %

What current I is needed to transmit 125 MW of power over a transmission line held at a voltage of 25.0 kV? I = Find the power loss Ploss that would occur in the transmission line if a 1.35 2 line is used to transmit 125 MW of power. Ploss = What percent loss does this represent? percent loss: A W %

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter20: Electric Current, Resistance, And Ohm's Law

Section: Chapter Questions

Problem 69PE: Unreasonable Results (a) What current is needed to transmit 1.00 102MW of power at 480 V? (b) What...

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Unreasonable Results (a) What current is needed to transmit 1.00 102MW of power at 480 V? (b) What power is dissipated by the transmission lines if they have a 1.00 -resistance? (c) What is unreasonable about this result? (d) Which assumptions are unreasonable, or which premises are inconsistent?
Integrated Concepts (a) Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 750-kg electric car be able to supply: (a) To accelerate from rest to 25.0 m/s in 1.00 min? (b) To climb a 2.00 102-m- high hill in 2.00 min at a constant 25.0-m/s speed while exerting 5.00 102 N of force to overcome air resistance and friction? (c) To travel at a constant 25.0-m/s speed, exerting a 5.00 102 N force to overcome air resistance and friction? See Figure 20.44.
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Integrated Concepts (a) What energy is dissipated by a lightning bolt having a 20,000-A current, a voltage of 1.00102 MV, and a length of 1.00 ms? (b) What mass of tree sap could be raised from 18.0°C to its boiling point and then evaporated by this energy, assuming sap has the same thermal characteristics as water?
(a) What is the unknown emfx in a potentiometer that balances when Rxis 10.0 O, and balances when Rsis 15.0for a standard 3.000-V emf? (b) The same emfx is placed in the same potentiometer, which now balances when Rsis 15.0for a standard emf of 3.100 V. At what resistance Rxwill the potentiometer balance?
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A young man owns a canister vacuum cleaner marked 535 W [at] 120 V and a Volkswagen Beetle, which he wishes to clean. He parks the car in his apartment parking lot and uses an inexpensive extension cord 15.0 m long to plug in the vacuum cleaner. You may assume the cleaner has constant resistance, (a) If the resistance of each of the two conductors in the extension cord is 0.900 , what is the actual power delivered to the cleaner? (b) If instead the power is to be at least 525 W, what must be the diameter of each of two identical copper conductors in the cord he buys? (c) Repeat part (b) assuming the power is to be at least 532 W.
A man foolishly tries to fish a burning piece of bread from a toaster with a metal butter knife and comes into contact with 120-V ac. He does not even feel it since, luckily, he is wearing rubber-soled shoes. What is the minimum resistance of the path tire current follows through the person?
What current ? is needed to transmit 105 MW of power over a transmission line held at a voltage of 25.0 kV? ?= A Find the power loss ?loss that would occur in the transmission line if a 1.45 Ω line is used to transmit 105 MW of power. ?loss= W What percent loss does this represent? percent loss:
a. What current (in kA) is needed to transmit 130 MW of power at a voltage of 29.0 kV? b. Find the power loss (in MW) in a 2.00 Ω transmission line. c. What percent loss does this represent? (only need part C)
A power transmission line is used to transmit 100 kW of power at a voltage of 10 kV with a loss of 1 kW. If the voltage is increased to 200 kV, what is power loss to transmit the same amount of power?