Question

A particular electric car is supplied with 300 kJ of chemical energy by the battery. Of this, a total of 70.5 kJ of energy is wasted as heat.
Calculate the overall efficiency of the electric car.

Answer 1

Supplied energy=300kJ

• Wasted energy=70.5J

Used energy:-

$\\ \sf\longmapsto 300-70.5=229.5kJ$

We know

$\boxed{\sf Efficiency=\dfrac{Used\:Energy}{Supplied\:Energy}\times 100}$

$\\ \sf\longmapsto Efficiency=\dfrac{229.5}{300}\times 100$

$\\ \sf\longmapsto Efficiency=\dfrac{229.5}{3}$

$\\ \sf\longmapsto Efficiency=76.5\%$