College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 20, Problem 91PE
(a) What is the resistance of a 220-V AC short circuit that generates a peak power of 96.8 kW? (b) What would the average power be if the average power be if the voltage was 120 V AC?
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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? Can you...Ch. 20 - An electrified needle is used to burn off warts,...Ch. 20 - Some surgery is performed with high-voltage...Ch. 20 - Some devices often used in bathrooms, such as...Ch. 20 - We are often advised to not flick electric...Ch. 20 - Before working on a power transmission line,...Ch. 20 - Why is the resistance of wet skin so much smaller...Ch. 20 - Could a person on intravenous infusion (an IV) be...Ch. 20 - In view of the small currents that cause shock...Ch. 20 - Note that in Figure 20.28, both the concentration...Ch. 20 - Define depolarization, repolarization, and the...Ch. 20 - Explain the properties of myelinated nerves in...Ch. 20 - What is the current in milliamperes produced by...Ch. 20 - A total of 600 C of charge passes through a...Ch. 20 - What is the current when a typical static charge...Ch. 20 - Find the current when 2.00 nC jumps between your...Ch. 20 - A large lightning bolt had a 20,000-A current and...Ch. 20 - The 200-A current through a spark plug moves 0.300...Ch. 20 - (a) A defibrillator sends a 6.00-A current through...Ch. 20 - During open-heart surgery, a defibrillator can be...Ch. 20 - (a) A defibrillator passes 12.0 A of current...Ch. 20 - A clock battery wears out after moving 10,000 C of...Ch. 20 - The batteries of a submerged non-nuclear submarine...Ch. 20 - Electron guns are used in X-ray tubes. 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- The average ac current delivered to a circuit is zero. Despite this, power is dissipated in the circuit. Explain.arrow_forwardWrite an expression for the output voltage of an ac source that has an amplitude of 12 V and a frequency of 200 Hz.arrow_forward(a) What is the resistance of a 220-V ac short circuit that generates a peak power of 96.8 kW? (b) What would the average power be if the voltage were 120 V ac?arrow_forward
- The power rating of a resistor used in ac circuits refers to the maximum average power dissipated in the resistor. How does this compare with the maximum instantaneous power dissipated in the resistor?arrow_forwardConsider the RC high-pass filler circuit shown in Figure P33.53. (a) Find an expression for the ratio of the amplitude of the output volt age to that of the input voltage in terms of R, C, and the AC source frequency . (b) What value does this ratio approach as the frequency decreases toward zero? (c) What value does this ratio approach as the frequency increases without limit?arrow_forwardThe maximum voltage in AC circuit is 100V . What is the effective voltage in circuit?arrow_forward
- (a) What is the resistance of a lightbulb that uses an average power of 60.0 W when connected to a 60.0-Hz power source having a maximum voltage of 170 V?(b) What is the resistance of a 150-W lightbulb? (Assume the lightbulb uses an average power of 150 W when connected to a power source having a maximum voltage of 170 V.)arrow_forwardConsider an AC power supply that provides a voltage of 14sin(223t) volts, where t is in seconds. The power supply is hooked up to a 132 Ohm resistor. What is the mean current through the resistor? What is the rms current through the resistor? What is the mean power being delivered to the resistor?arrow_forwardExample: (a) What is the value of the peak voltage for 120-V AC power? (b) What is the peak +V, power consumption rate of a 60.0-W AC light bulb? For (a): -Vo Solving the equation Vrms= for the peak voltage Vo and substituting the known value for Vms gives: Vo=2-vZVrms=1.414(120 V)= 170 V. This means that the AC voltage swings from 170 V to -170 V and back 60 times every second. An equivalent DC voltage is a constant 120 V. For (b): Peak power is peak current times peak voltage. Thus, Figure 2. The potential difference V between the terminals of an AC voltage So the power swings from zero to 120 W on hundred twenty times per second (twice each cycle), and the power averages 60 W. fluctuates shown. The Po= loVo = 2(; loVo) = 2Pave. source as mathematical expression for V is given by V = Vosin2nft Po = 2(60.0 W) = 120 W. Average power Activity: Given a transmission line having a line resistance of 5.000 sove for the following. Use the rubrics as your guide in presenting your solution…arrow_forward
- (a)What is the resistance (in Ω) of a 240 V AC short circuit that generates a peak power of 97.5 kW? ____ Ω (b)What would the average power (in kW) be if the voltage was 120 V AC? ____ kWarrow_forwardA series RLC circuit has the following parameter: 7 Ω, 5 mH, 25 µF respectively. Connected to a 220 V AC 62 Hz power supply. Find the total current of the circuitarrow_forwardAt its highest temperature, a space heater has a resistance of 47.5 ohms when it is plugged into a wall outlet that supplies a peak voltage of 162.6 V sinusoidally at 60 Hz. What is the average power output of the space heater?arrow_forward
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