I’m trying to figure out how to track the energy production from a battery to a motor as in an electric car. For example, the basic and primary components of an electric car are as follows: battery > controller > electric motor > driveline ====> car moves What I’m trying to figure out is how to measure how much energy the battery is really providing to make the car move and track that energy use through all the components to the end. It doesn't seem correct to use the voltage or the amps to do that, so I assume you should use kilowatts (volts x amps). Plus some of the energy is in the form of electricity and some is in the form of mechanical. I don’t know if I've got my terminology correct. But… Assume the battery is 120 volt and 10 amps. Then that means the battery is able to provide 1.2 kW of power (or is it energy? I know there’s a difference but can’t always remember which term to use). Therefore, is it right to say this? 1. Battery produces 1.2 kW of power which it then passes to the Controller > 2. Controller then passes the 1.2 kW of power to the motor > 3. Motor then passes the 1.2 kW of power to driveline > 4. Driveline then uses the 1.2 kW of power to move the car Now I kept it simple, but in reality some power get’s lost along the way through friction, heat, or whatever. But wasn’t sure how to show that. Am even close to describing this right? Should I use some other measure instead of kW?