How Efficient is Your Electric Car?
What is the well-to-wheel efficiency of an electric car in km/MJ?
An electric car consumes 60 kWh of electricity from the battery to travel for 360 km distance. The well-to-electric outlet efficiency of the electricity using for charging the battery is 50%. The charging efficiency of the battery is 90% and its delivering efficiency of the charged electricity to turn the wheel is 90%. Calculate the well-to-wheel efficiency of the electric car in km/MJ.
Answer:
The well-to-wheel efficiency of the electric car is 40.5% km/MJ.
Explanation:
To calculate the well-to-wheel efficiency of the electric car, we need to consider the different efficiencies involved in the process. The well-to-electric outlet efficiency is given as 50%, the charging efficiency of the battery is 90%, and the delivering efficiency is 90%. To calculate the well-to-wheel efficiency, we multiply these efficiencies together: 50% * 90% * 90% = 40.5%. To determine the well-to-wheel efficiency in km/MJ, we need to convert the energy consumption from kWh to MJ. 1 kWh is equal to 3.6 MJ, so we divide the energy consumption of 60 kWh by 3.6 to get 16.67 MJ. Now, we can divide the distance traveled in km (360 km) by the energy consumption in MJ (16.67 MJ) to get the well-to-wheel efficiency in km/MJ: 360 km / 16.67 MJ = 21.6 km/MJ.