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calculating resistor power rating

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sweethomela8

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Hi im trying to figure out what power rating i need for a resistor (ie. 1/10 W, etc)
from what i read, the power rating is the power across the resistor..is this right?

To calculcate it, do I just find the power by (v^2)/Resistance...
where v is the difference in voltage on both sides of the resistor ? (Vin-Vout in other words)....or am I calculating this incorrectly.

Thanks.
 

Yes, your calculation is correct. It is the power that will be dissipated in the resistor rather than the power 'across' the resistor.

Keith
 

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