Problem 1. AC Circuits-four short questions. (a) Explain the difference between instantaneous, peak, and RMS quantities, and give some examples of when it is appropriate to use each one. (b) For electrical power, (instantaneous) p is only true sometimes. Give a situation where it works, and a situation where it fails, and explain why it fails. = iv is always true, but (average) Pavg Irms Vrms (c) AC circuits gained prevalence over DC circuits for power distribution because of the ease of transforming between high and low voltage. Explain why a transformer (which uses magnetic induction between two coils of wire) works for AC but not for DC. (d) Suppose an electrical distribution line has a resistance of 1 ohm and needs to deliver 1 MW (megawatt) of electrical power. Is it more efficient to deliver that power at Vrms at Vrms question. (Hint: Actual distribution lines are high-voltage, so...) = 120 V or 120 kV? Calculate the power wasted as heat in the distribution line to answer the
Problem 1. AC Circuits-four short questions. (a) Explain the difference between instantaneous, peak, and RMS quantities, and give some examples of when it is appropriate to use each one. (b) For electrical power, (instantaneous) p is only true sometimes. Give a situation where it works, and a situation where it fails, and explain why it fails. = iv is always true, but (average) Pavg Irms Vrms (c) AC circuits gained prevalence over DC circuits for power distribution because of the ease of transforming between high and low voltage. Explain why a transformer (which uses magnetic induction between two coils of wire) works for AC but not for DC. (d) Suppose an electrical distribution line has a resistance of 1 ohm and needs to deliver 1 MW (megawatt) of electrical power. Is it more efficient to deliver that power at Vrms at Vrms question. (Hint: Actual distribution lines are high-voltage, so...) = 120 V or 120 kV? Calculate the power wasted as heat in the distribution line to answer the
Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter33: Alternating Current Circuits
Section: Chapter Questions
Problem 33.7CQ
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Can you answer problem 1 in this image?
Transcribed Image Text:Problem 1. AC Circuits-four short questions.
(a) Explain the difference between instantaneous, peak, and RMS quantities, and give some
examples of when it is appropriate to use each one.
(b) For electrical power, (instantaneous) p
is only true sometimes. Give a situation where it works, and a situation where it fails, and
explain why it fails.
= iv is always true, but (average) Pavg
Irms Vrms
(c) AC circuits gained prevalence over DC circuits for power distribution because of the ease of
transforming between high and low voltage. Explain why a transformer (which uses magnetic
induction between two coils of wire) works for AC but not for DC.
(d) Suppose an electrical distribution line has a resistance of 1 ohm and needs to deliver 1 MW
(megawatt) of electrical power. Is it more efficient to deliver that power at Vrms
at Vrms
question. (Hint: Actual distribution lines are high-voltage, so...)
= 120 V or
120 kV? Calculate the power wasted as heat in the distribution line to answer the
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