Question

Can someone solve this
plz..
it's my humble request

Answer 1

Both the expressions are correct. In the first case, I remain constant whereas the second expression is true when V remains constant

So, the expression P = I2R is used when resistances are connected in series because in series connection the current in each resistance is constant.

Similarly, when resistances are connected in parallel the voltage is constant and so power becomes inversely proportional to R.