Question

What is the power p supplied to a resistor whose resistance is r when it is known that it has a voltage v across it?

Answer 1

power p=V^2/r.

since power=voltage ×current

current=V/R (from ohm law)

by substituting them we get

P=${v}^{2} \div r$

p=v^2/r
hope the answer is helpful

Answer 2

Answer:

Power, p = v^2/r

Explanation:

we know, power is the ability of doing work.

so, power, p = voltage, v * current, I

    p= VI     --------1

from ohms law

  v= I r

 I = v/r   -----------2

substituting the value of I in equation 1

  p =v(v/r)

  p = v^2/r

therefore, power, p = v^2/r