Think of the electricity going to your device like a waterfall powering a water wheel.
The current is the water.
The outlet is simply the cliff the water flows down to create the waterfall which powers your device.
When nothing is plugged in, all you have is a really high cliff. You attaching a power strip is just you saying you want to run multiple streams of water down the cliff. If you plug in multiple devices then you will need more water but not necessarily a higher cliff.
The national grid is a huge lake that can easily provide you with the multiple streams of water to power all the devices.
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