Which one of the following expressions gives the efficiency of an ideal heat engine…

PHYSICS · Single correct · A Level · Physics · Engineering physics · Engineering physics

Problem

Which one of the following expressions gives the efficiency

\eta

of an ideal heat engine working between a hot reservoir at absolute temperature

T_H

and a cold reservoir at

T_C

? (a)

\eta=1-\dfrac{T_H}{T_C}

(b)

\eta=\dfrac{T_H-T_C}{T_H+T_C}

(c)

\eta=1-\dfrac{T_C}{T_H}

(d)

\eta=\dfrac{T_C}{T_H}