Thévenin's theorem

Thévenin's Theorem is a way for us to look at a complicated electrical circuit that has a bunch of wires and components. We can use the theorem to simplify the complicated circuit into something much simpler so it's easier to work with.

It works like this: Imagine the circuit has a big hill with a bunch of trees on top. Thévenin's Theorem says that you can treat the hill as if it was a big flat surface and get rid of the trees. So instead of having a hill with a bunch of trees, it's just a big flat surface.

Similarly, in the circuit, you can get rid of all of the wires and objects that might be connected to it and just look at two things: the voltage and the resistance. Voltage is like the height of the hill and resistance is like how wide the hill is - so if you know the voltage and resistance you can get a good idea of what the circuit looks like.