1. An electric heater has a Nichrome heating element with a resistance of 8.00 N at 20°C. When 120 V are applied, the electric current heats the Nichrome wire to 900°C. What is the operating wattage of this heater? (The temperature coefficient of resistivity of Nichrome is a = 0.0004 Co-1) Watts

1. An electric heater has a Nichrome heating element with a resistance of 8.00 N at 20°C. When 120 V are applied, the electric current heats the Nichrome wire to 900°C. What is the operating wattage of this heater? (The temperature coefficient of resistivity of Nichrome is a = 0.0004 Co-1) Watts

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter20: Electric Current, Resistance, And Ohm's Law

Section: Chapter Questions

Problem 12CQ: Explain why R=R0(1 + a?T) for the temperature variation of the resistance R of an object is not as...

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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

1. An electric heater has a Nichrome heating element with a resistance of 8.00 2 at 20°C. When 120 V are applied, the electric
current heats the Nichrome wire to 900°C. What is the operating wattage of this heater? (The temperature coefficient of resistivity
of Nichrome is a = 0.0004 Co-1)
Watts
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of19 o01

Expert Solution

Step 1

Given,

Resistance = 8 Ω

Initial Temperature (T₀) =20 $°$ C

Final Temperature (T)=900 $°$ C

current (U) =120 V

Temperature coefficient of resistivity, $α$ =0.0004 C^-1

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