Question

Power P in terms of V android R. From Ohms Formula

Answer 1

p= vI ....
I=v/r

so ...p= V²/r.

Answer 2

We know that :-

P = V×1

Also, From Ohm's Law we have, V/1 =R

Or V = I × R

Or I = V/R

Putting this value of I in equation (1) , we get :

P = V × V/R

Or Power, P = V Square/R

Where V = Potential difference ( or Voltage)
and R = Resistance

This formula is to be used for calculating power when voltage V and resistance R are known to us.

It is clear from equation (3) that power is inversely proportional to the resistance.


Thanks☺️