How does the MGU-K work?

Having looked at the brakes, a lot of people wanted to know HOW the MGU-K slows the car down by adding to the rear wheel braking.

We'll look at: 

- how the MGU-K turns electrical energy from the battery into power for the rear wheels

- how the MGU-K turns power from the spinning rear wheels back into electrical energy

- how MGU-K braking occurs

- how this all happens thanks to the interplay between electrical charge and magnetism!