COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 21, Problem 79QAP
To determine
(a)
The power dissipated in the cord, which is used to deliver 1500 W of power, when the power is delivered at 12 V rms.
To determine
(b)
The power dissipated in the cord, which is used to deliver 1500 W of power, when the power is delivered at 120 V rms.
To determine
(c)
Which of the voltages-12 V rms or 120 V- rms can be used to power the electrical device.
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An electric hair dryer is rated at 1500W at 120V. The rated power of this hair dryer is the average power drawn by the device, and the rated voltage is the rms voltage. Calculate the resistance, the rms current, and the maximum instantaneous power. Assume that the hair dryer is a pure resistor.
(a) What is the resistance of a lightbulb that uses an average power of 65.0 W when connected to a 60.0 Hz power source having a maximum voltage of 180 V?
Ω
(b) What is the resistance of a 110 W bulb?
2
Need
The rms current through a light bulb is 0.527 A when the bulb is connected to a standard 120 V rms source.
(a) Find the bulb's resistance.
(b) Find the peak instantaneous current.
(c) Find the peak instantaneous voltage.
(d) Find the average electrical power used by the bulb.
Chapter 21 Solutions
COLLEGE PHYSICS
Ch. 21 - Prob. 1QAPCh. 21 - Prob. 2QAPCh. 21 - Prob. 3QAPCh. 21 - Prob. 4QAPCh. 21 - Prob. 5QAPCh. 21 - Prob. 6QAPCh. 21 - Prob. 7QAPCh. 21 - Prob. 8QAPCh. 21 - Prob. 9QAPCh. 21 - Prob. 10QAP
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- In Figure P33.71, find the rms current delivered by the 45.0-V (rms) power supply when (a) the frequency is very large and (b) the frequency is very small.arrow_forwardThe average ac current delivered to a circuit is zero. Despite this, power is dissipated in the circuit. Explain.arrow_forwardSuppose you connect a small lightbulb across a DC power supply that has an emf of 5.0 V. You then connect the bulb across a 60.0-Hz AC power supply that has an rms voltage of 5.0 V. Does the bulb dissipate more power on average when it is connected to the DC power supply or the AC power supply? Is the bulb brighter when it is connected to the DC power supply or the AC power supply? Explain.arrow_forward
- Consider 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_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_forwardA microphone has a resistance of 7.8 Ω. When the microphone is connected to a voltage source, the average power it dissipates is 89 W. (a) What is the rms current? in A(b) What is the peak voltage?arrow_forward
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