COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 18, Problem 25QAP
To determine
The current in a high voltage transmission line.
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A power transmission line carries 520 A of current at a voltage of 924 kV. If the line has a resistance of 48 u/m, what is the rate at which energy is being dissipated (in kW) over 509 km of line?
Be fast.. asap
How to solve this question
"Thermal energy" situations exist everyday in our homes, but we don't call them "thermal energy" applications. We call them baking, cooking, or turning up the house heater. Let's look at a small hair dryer that draws 10A of current under a typical household 120V voltage.
What is the power rating of the hair dryer in watts?
Depending on the application, the time unit of minutes or hours are preferred over the time unit of seconds often used in physics. Utility companies use kilowatt-hour units for energy rather than the watt-second units. These units are more practical given how much energy a home uses. Let's say you run the hair dryer 6 minutes to dry your hair.
How much energy was used in Watt-hour units?
What is this energy in kilowatt-hours (kWh) ?
Electricity is not free. Someone pays the electric utility bill so you can run the hair dryer, heat the home, cook and bake. The average electricity rate in the U.S. is about 10 cents per kilowatt-hour. (By the way, the state of…
Chapter 18 Solutions
COLLEGE PHYSICS
Ch. 18 - Prob. 1QAPCh. 18 - Prob. 2QAPCh. 18 - Prob. 3QAPCh. 18 - Prob. 4QAPCh. 18 - Prob. 5QAPCh. 18 - Prob. 6QAPCh. 18 - Prob. 7QAPCh. 18 - Prob. 8QAPCh. 18 - Prob. 9QAPCh. 18 - Prob. 10QAP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- A 4.0-2 resistor is connected to a 12-02 resistor and this combination is connected to an ideal dc power supply with voltage V = 12 volts as shown in the figure. What is the value of current in the 12- resistor? O 1 A O 3 A 12 A O 15 A O 4 A 4.00 www www 1202arrow_forwardAn overhead high voltage (4.0x105 V) power transmission line delivers electrical energy from a generating station to a substation at a rate of 1500 MW (1.5x109 W). Determine the resistance of and the current in the cables.arrow_forwardWhat is the value of the unknown voltage indicated in the picture. Assume that the wire connected to the negative terminal of the power supply is at 0 V.arrow_forward
- Common household appliances are rated at 110 V, but power companies deliver voltage in the kilovolt range and then step the voltage down using transformers to 110 V to be used in homes. You will learn in later chapters that transformers consist of many turns of wire, which warm up as current flows through them, wasting some of the energy that is given off as heat. This sounds inefficient. Why do the power companies transport electric power using this method?arrow_forwardAn electric device with effective power 530 mW is connected to an alternating source which gives effective voltage 50 V. What is the maximum value of electric current in that circuit? A. 106 mA В. 10.6 mA С. 1.5 mA D. 150 mA (E) 15 mAarrow_forwardin the circuit given below v What is the voltage value ? ia 33 - 2ia 5mA 1kN 3 kN. O A) 1.2 V O B) 2.4 V OC) 0.9 V O D) 3.6 V O E) 1.5 Varrow_forward
- 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?arrow_forwardThe following appliances are connected to a single 120 V, 15 A circuit in a kitchen: a 330 W blender, a 1000 W coffeepot, a 150 W coffee grinder, and a 750 W microwave oven. If these are all turned on at the same time, will they trip the circuit breaker?arrow_forwardA 60 W (120 V) night light is turned on for an average of 12 h a day year round. What is the annual cost of electricity at a billing rate of +0.10/kWh?arrow_forward
- 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?arrow_forwardIn this problem, you will verify statements made at the end of the power losses for Example 20.10. (a) What current is needed to transmit 100 MW of power at a voltage of 25.0 kV? (b) Find the power loss in a 1.00 transmission line. (c) What percent loss does this represent?arrow_forward(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?arrow_forward
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