Imagine electrons as little blue pixies.
These pixies don’t like the “noise” (moving magnetic field made by the generator) so they try to run away from it. The bigger the noise the harder they try to move away from it (voltage) and the more they will push on the pixies ahead of them to do this.
They only have this tube to run away down though (a wire) and when it’s big this is OK as there’s lots of room for the pixies to run BUT we put a small wire (like the one in your toaster) in the way and they all bunch up and can’t get through as easily and they “rub together” as the pixies behind them are pushing them through the small wire. This creates a lot of heat that we use to toast our bread
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