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Grade: 10
        
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 directy proportional to R whereas the second expression indicates inverse proportionality. How can the seemingly dependence of P and R in this expression be explained?
one year ago

Answers : (2)

Sujit Kumar
111 Points
							
Look Resistance is a constant. You can't say something is directly or inversely proportional to a constant
In the equation
V = iR
V is proportional to i, and R (Resistance) is the constant
Similarly Power is directly proportional to the square of the current and inversely proportional to the square of the voltage.
Hope it's clear now
 
one year ago
Mubashir ah
38 Points
							In the first expression,P is directly proportional to R & in second it is inversely protional to R.But it must be noted that in first we take I as constant and in 2nd we take V as constant.
						
10 months ago
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