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.

17 The total energy supplied to an electric motor is E. Energy Q is wasted and the remaining energydoes useful work.What is the efficiency of the motor?A QE B QE    – 1 C 1 – QE    D (1 )QE

A car is driven along a level road. The total energy is put from the petrol is 60 KJ and the car wastes 45KJ of energy. What is the efficiency of the car?

Petrol cars transform chemical energy into useful kinetic energy. A typical energy efficiency of this transformation is 15%.Compare the efficiency of the petrol car to the electric car described above.Hint: Use your answer from the previous question to answer this.

(e)     When the heater is supplied with 120 J of energy each second, the internal energy of theice increases by 45 J each second.Use the following equation to calculate the efficiency of the heater.

Directions: Select the choice that best fits each statement. The following question(s) refer to the following energy efficiencies, expressed percentages.(A) 100%(B) 95%(C) 30%(D) 15%(E) 1%QuestionThe maximum efficiency possible in an energy-conversion process that is not limited by the second law of thermodynamics