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The electric power consumed by a device may be calculated by using either of the two expressions P = I^2R or P = V^2/R . The first expression indicates that it is directly proportional to R whereas the second expression indicates inverse proportionality. How can the seemingly different dependence of P on R in these expressions be explained.
 

5 years ago

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Answers : (1)

										

Dear Aditya


You are not looking at other variables. Other variables are V and I. Suppose in a circuit there is a battery of V volt and resistance R. then I=V/R


P=I2R


put V=IR


P=V2/R


hence I and V are not constant here They are dependent on each other and they are relatad using R.


So you cant say P is directly or inversely proportional to R as other variables are not constant.


 


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5 years ago

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