Magnetic core

Okay kiddo, so a magnetic core is kind of like a special toy that helps us control how electricity flows. It's like a little magnet that we wrap a bunch of wire around and when we send electricity through the wire, it makes the magnet stronger. And when we turn off the electricity, the magnet gets weaker again.

Now, the reason we use these magnetic cores is because they are super helpful in things like transformers and other electrical devices. They help us change the amount of electricity that is flowing, which can be really important for making sure machines work properly and safely.

So basically, a magnetic core is just a really cool tool that helps us work with electricity to make sure everything runs smoothly. Neat, huh?