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Old Jul 21st 2014, 01:42 AM   #1
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A problem on entropy

Help required to solve physics homework problem

A current of 4 A passes through a 60 ohm resistor for 5 min. The resistor is cooled by the continuous passage of fast running water (enough water so that its temperature essentially remains constant). The room temperature is 290K. Then how to calculate the rate of entropy change of the resistor and surroundings?

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Old Jul 21st 2014, 07:33 AM   #2
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Change in entropy is (-Delta Q)/T. The heat flow is equal to the energy that is generated through heating of the resistor in Joules, which is the power flowing through the resistor in watts (power = i^2R) times the time in seconds. T is the ambient temp in kelvins.
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