They don’t have moving parts, but they do have electrical switches (transistors) which control the flow of current. You can think of a transistor as an electrical component with 3 parts, the input, the output and the gate. By default current can’t flow between the input and output, but by applying a voltage to the gate you can allow current to flow.
Having these electrical switches lets you build up logic gates and adding circuits which among other things all come together for form the processor.
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