How do extension cables or power strips supply power for 3 plugs if they’re only plugged into 1 outlet?
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You can [look inside one](https://upload.wikimedia.org/wikipedia/commons/f/fd/Power_strip_inside_with_plug.jpg) to see how it works. The hot side has a bar that touches all the hot pins and the neutral side has a second bar for the neutral pins. In a three-prong strip, there’s a third bar for the ground pins.
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