Positive temperature coefficient

Okay, so you know how sometimes things get hotter when you touch them or rub them together? Well, there are some things that can actually get hotter all by themselves without you doing anything to them.

These things are special materials called positive temperature coefficient (PTC) materials. When electricity flows through them, they start to resist the flow of electricity and get really warm.

It's like when you try to run through thick mud - the more mud there is, the harder it is to run, and the more tired you get. With PTC materials, the more electricity there is flowing through them, the harder it is for the electricity to keep flowing, and the hotter the PTC material gets.

This might seem like a bad thing, but PTC materials can actually be really useful. For example, they can be used to make devices that automatically turn off when they get too hot. This is important because if something gets too hot, it can become dangerous or stop working properly.

So, positive temperature coefficient materials are special materials that get hotter when electricity flows through them, and they can be very helpful in keeping things from getting too hot!