Joule heating

Okay kiddo, so let's say you have a toy car with a battery inside. The battery has energy stored in it, kind of like how your own body has energy when you eat food.

Now when you turn on the toy car and it starts moving, it uses up some of the energy in the battery to make it work. But here's the thing - some of the energy doesn't just make the car move, it also creates heat!

Just like how you might feel warm after running around and using up energy, the battery in the toy car gets warm too. This is because of something called Joule heating, which is when the energy from the battery turns into heat as it passes through the wires and other parts of the toy car.

So basically, Joule heating is when energy that's being used up in a machine or device also creates heat as a byproduct. And it's named after a guy named James Prescott Joule, who discovered this phenomenon a long time ago. And that's it, pretty cool huh?