Physics

Problem

For a resistor of resistance

R

carrying a steady current

I

, which one of the following expressions correctly gives the electrical power dissipated using only

I

and

R

? a)

P = \dfrac{I^{2}R}{\sqrt{2}}

P = 2I^{2}R

P = I^{2}R

P = \dfrac{1}{2} I^{2}R