25.48 A 2000 W" electric heater is designed to operate on a 230 V supply. (a) What is its operating resistance? (b) What current does it draw? (c) If the voltage drops to 220 V, what power does the heater take? (Assume that the resistance is constant. Actually, it will change because of the change in temperature.) (d) The heater coils are metallic, so that the resistance of the heater decreases with decreasing temperature. If the change of resistance with temperature is taken into account, will the electrical power consumed by the heater be larger or smaller than what you calculated in part (c)? Explain.

25.48 A 2000 W" electric heater is designed to operate on a 230 V supply. (a) What is its operating resistance? (b) What current does it draw? (c) If the voltage drops to 220 V, what power does the heater take? (Assume that the resistance is constant. Actually, it will change because of the change in temperature.) (d) The heater coils are metallic, so that the resistance of the heater decreases with decreasing temperature. If the change of resistance with temperature is taken into account, will the electrical power consumed by the heater be larger or smaller than what you calculated in part (c)? Explain.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Temperature Variance of Resistance

Electrical resistance or simply resistance is the property of a material that opposes the free flow of electrons through it. The total amount of resistance to the flow of charges (or current) is affected by many factors like the length of the conducting material, its cross-sectional area, resistivity, and temperature.

Question

25.48 A "2000 W" electric heater is designed to operate on a 230 V
supply. (a) What is its operating resistance? (b) What current does it
draw? (c) If the voltage drops to 220 V, what power does the heater take?
(Assume that the resistance is constant. Actually, it will change because
of the change in temperature.) (d) The heater coils are metallic, so that
the resistance of the heater decreases with decreasing temperature. If
the change of resistance with temperature is taken into account, will the
electrical power consumed by the heater be larger or smaller than what
you calculated in part (c)? Explain.
BURSA

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