An electric current of 6.4 A passing through a resistor has a measured voltage of 9V across the resistor. The resistor is cylindrical with a diameter of 2.5 cm and length of 15 cm. The resistor has a uniform temperature of 115°C and the room air temperature is 23°C. Assuming that heat transfer by radiation is negligible, determine the heat transfer coefficient by convection.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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Question 1

An electric current of 6.4 A passing through a resistor has a measured voltage of 9V
across the resistor. The resistor is cylindrical with a diameter of 2.5 cm and length of
15 cm. The resistor has a uniform temperature of 115°C and the room air temperature
is 23°C. Assuming that heat transfer by radiation is negligible, determine the heat
transfer coefficient by convection.

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