Question

HELP!!

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=(Used\:Energy)/(Supplied\:Energy)* 100}`

`\\ \sf\longmapsto Efficiency=(229.5)/(300)* 100`

`\\ \sf\longmapsto Efficiency=(229.5)/(3)`

`\\ \sf\longmapsto Efficiency=76.5\%`