Which of the following expressions gives the electrical power dissipated in a…

MATHEMATICS · Single correct · A Level · Mathematics · Quantities and units in mechanics · Quantities and units in mechanics

Problem

Which of the following expressions gives the electrical power

P

dissipated in a resistor of resistance

R

when a potential difference

V

is applied across it? (a)

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

(b)

P = \dfrac{1}{2}VI

(c)

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

(d)

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