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

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

Which of the following expressions gives the electrical power

P

dissipated in a resistor of resistance

R

when a current

I

flows through it? (a)

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

(b)

P = I^{2}R

(c)

P = IR

(d)

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