27. Resistors & DC Circuits
Power in Circuits
4:26 minutes
Problem 25.45
Textbook Question
Textbook Question(III) A 1.0-m-long round tungsten wire is to reach a temperature of 3100 K when a current of 18.0 A flows through it. What diameter should the wire be? Assume the wire loses energy only by radiation (emissivity ∊ = 1.0 , Section 19–10) and the surrounding temperature is 20°C.
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