[SOLVED] Sense resistor's power dissipation in a constant current source?

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lee321987

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Hello.
I have built a constant current source, and I'm trying to figure out how to calculate the power dissipated by the sense resistor at various currents.

I know how to do this for a voltage source, but i am perplexed as far as a current source....?

The circuit:
+12V-------MOSFET------resistor--------load--------GND
 

Does this equation still work if the current and/or resistance are below zero?
 

The resistance of a resistor is never less than zero. The equation works for either direction of current flow.
 
Oops, i meant: if current or resistance are less than one.

e.g. (0.5A ^2) * 0.3R = 0.075W power dissipation...?

Does it still work?
 

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