Physics

Problem

Which of the following expressions gives the electrical power

P

dissipated in a resistor solely in terms of the potential difference

V

across it and its resistance

R

? a)

P = \dfrac{V^{2}}{2R}

P = \dfrac{2V^{2}}{R}

P = \dfrac{V^{2}}{R}

P = \dfrac{V^{2}}{\sqrt{2}\,R}