- #1
bmarson123
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Homework Statement
An electric current of 10A runs for 1 minute through a 20 ohm Resistor which is maintained at 10 degC by being immersed in running water. What are the entropy changes in a) the resistor b) the running water c) the universe
Homework Equations
P = I2R
dS = dQ/T
The Attempt at a Solution
For a) there is no change in the entropy as it is work done by the resistor, not heat.
b) I've calculated P = 2000W = 2000J
The problem I'm having is formulating the path between the initial and final states of the system because of the constant temperature. I'm also not sure if I'm using the right equation?
c) This will be the same as the answer for b) I think.