Assuming you mean computer processor (CPU, central processing unit), there’s not a good way to ELI5 that.
Electricity controls logic gates, and there are upwards of 100 million of them in a CPU.
So, by controlling how much electricity goes where in a processor, is like asking the processor to remember just a little bit of information, but a really large number of times. Then you can ask it for the answer when it manages all those tiny bits of information as a whole.
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