College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 20, Problem 44PE
Find the power dissipated in each of these extension cords: (a) an extension cord having a 0,0600 −Ωresistance and through which 5.00 A is flowing; (b) a cheaper cord utilizing thinner wire and with a resistance of
0.300 O.
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Find the power dissipated (in W) in each of the following extension cords:
Part (a) An extension cord having a 0.085 Ω resistance and through which 5.00 A is flowing.
Part (b) A cheaper cord utilizing thinner wire and with a resistance of 0.32 Ω through which 5.00 A is flowing.
A 205-kV power transmission line carrying 500 A is hung from grounded metal towers by ceramic insulators, each having a
1.05 x 10⁹ resistance.
(a) What is the resistance to ground of 40 of these insulators? (Assume the insulators are connected in parallel.)
Ω
(b) Calculate the power dissipated by 40 of them.
W
(c) What fraction of the power carried by the line is this?
Ptotal
=
Find the power (in W) dissipated in each of these extension cords.
(a) an extension cord having a 0.0500 Ω resistance and through which 5.05 A is flowing. W
(b) a cheaper cord utilizing thinner wire and with a resistance of 0.250 Ω and through which 5.05 A is flowing. W
Chapter 20 Solutions
College Physics
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Ch. 20 - If aluminum and copper wires of the same length...Ch. 20 - Explain why R=R0(1 + a?T) for the temperature...Ch. 20 - Why do incandescent lightbulbs grow dim late in...Ch. 20 - The power dissipated in a resistor is given by P =...Ch. 20 - Give an example of a use of AC power other than in...Ch. 20 - Why do voltage, current, and power go through zero...Ch. 20 - You are riding in a train, gazing into the...Ch. 20 - Using an ohmmeter, a student measures the...Ch. 20 - What are the two major hazards of electricity?Ch. 20 - Why isn’t a short circuit a shock hazard?Ch. 20 - What determines the severity of a shock? 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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?arrow_forwardIntegrated 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.arrow_forwardExplain why R=R0(1 + a?T) for the temperature variation of the resistance R of an object is not as accurate as P=P0(1 + a?T) which gives the temperature variation of resistivity P.arrow_forward
- The power dissipated in a resistor is given by P = V2/R, which means power decreases if resistance increases. Yet this power is also given by P = I2R, which means power increases if resistance increases. Explain why there is no contradiction here.arrow_forwardWhen the switch is open in Figure 18.8, power Po is delivered to the resistor R1. When the switch is closed, which of the following is true about the power Pc delivered to R1? (Neglect the internal resistance of the battery.) (a) Pc Po (b) Pc = Po (c) Pc Po Figure 18.8 (Quick Quizzes 18.5 and 18.6)arrow_forwardFind the power dissipated in each of these extension cords: (a) an extension cord having a 0.0600 - Ω resistance and through which 5.00 A is flowing; (b) a cheaper cord utilizing thinner wire and with a resistance of0.300 Ω .arrow_forward
- Problem 4: Find the power dissipated (in W) in each of the following extension cords: Part (a) An extension cord having a 0.095 Ω resistance and through which 5.00 A is flowing. Part (b) A cheaper cord utilizing thinner wire and with a resistance of 0.36 Ω through which 5.00 A is flowing.arrow_forwardA 175-kV power transmission line carrying 500 A is hung from grounded metal towers by ceramic insulators, each having a 1.45 x 109 2 resistance. (a) What is the resistance to ground of 50 of these insulators? (Assume the insulators are connected in parallel.) 2 (b) Calculate the power dissipated by 50 of them. W (c) What fraction of the power carried by the line is this? P Ptotalarrow_forwardFind the power dissipated in each of these extension cords: (a) an extension cord having a 0.0600−Ω resistance and through which 5.00 A is flowing; (b) a cheaper cord utilizing thinner wire and with a resistance of 0.300Ω.arrow_forward
- A 240-kV power transmission line carrying 5.00×102 A is hung from grounded metal towers by ceramic insulators, each having a 1.00×109 -Ω resistance. (a) What is the resistance to ground of 100 of these insulators?(b) Calculate the power dissipated by 100 of them. (c) What fraction of the power carried by the line is this?arrow_forwardFind the power (in W) dissipated in each of these extension cords. (a) an extension cord having a 0.0500 Ω resistance and through which 5.10 A is flowing...... ANS: _____ W (b) a cheaper cord utilizing thinner wire and with a resistance of 0.250 Ω and through which 5.10 A is flowing....ANS: _____Warrow_forwardA 170-kV power transmission line carrying 500 A is hung from grounded metal towers by ceramic insulators, each having a 1.05 109 Ω resistance. (a) What is the resistance to ground of 60 of these insulators? (Assume the insulators are connected in parallel.) (b) Calculate the power dissipated by 60 of them.(c) What fraction of the power carried by the line is this?arrow_forward
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