Voltage sag

Imagine you have a toy car that needs batteries to run. When the batteries are new and fully charged, the car can go very fast because there is a lot of power running through the toy. But as time goes by and the batteries get weaker, the car slows down and can't go as fast. This is kind of what happens with electricity too.

A voltage sag is when there is a temporary drop in the amount of power that is moving through an electric circuit. This can happen when too many devices are using electricity in the same place at the same time, or when there is a problem with the power source like a blackout. When there is a voltage sag, the power level drops for a little bit and then goes back up again.

This can be a problem for things like computers or other sensitive electronics because they need a steady supply of power to work properly. When the voltage level drops, it can cause the computer to crash or shut down, which can be really frustrating.

So, just like how your toy car slows down when the batteries get weaker, a voltage sag can make devices work slower or even stop working for a little bit. It's important to make sure that the power source is strong enough and that you're not using too many devices at once, so that you don't get a voltage sag.