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the electric power consumed by a device may be calculated by using either two expressions P=Isq.R or P=Vsq/R. the first expression indicates that it is directly proportion to R whereas the second expression indicates inversely propotionality. how can the seemingly different dependence of P and R in these two expression explained?

the electric power consumed by a device may be calculated by using either two expressions P=Isq.R or P=Vsq/R. the first expression indicates that it is directly proportion to R whereas the second expression indicates inversely propotionality. how can the seemingly different dependence of P and R in these two expression explained?

Grade:10

1 Answers

Umakant biswal
5349 Points
7 years ago
@ sai 
the first one is used when I is constant, and the second one is used when V is constant. 
both the expressions are actually true , 
so, it depends upon situations which quantity will remain constant , and which one is variable 
thats the reason we cannot say , when resi. wl increased , the power will increase or decrease . 
HOPE IT CLEARS NOW 

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