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Because the power needed to make them work is delivered by a national 'grid' of electrical cables. There is no way to actually transmit power to an appliance through the air. It must be deilvered by cables.

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Q: Why do electrical appliances need to be plugged into the wall?
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By being plugged into the electrical socket in the wall that gives it electricity.


What energy is in a wall plug?

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Can i use dishwasher and washing machine on multiple plug?

If you only have one wall socket where the washing machine and dishwasher are, then you could plug in a multi-plug adaptor, into which both appliances could then be plugged in. There are also multi sockets in a strip with a single plug on a short cable available. For instance, in my outhouse, I have a dryer and a washing machine that are plugged into a three way adaptor. The adaptor is then plugged into a RCD, or residual current device. Finally, the RCD is plugged into the single wall socket.


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No. Electrical appliances, when plugged in, create a "circuit." That means that there's an entry and an exit with a powered device somewhere inline. That's why there are two prongs on a plug. On the power adapter for your cell phone the circuit isn't complete unless it's plugged into the phone, so no power will flow through it. ______________ Not entirely true. Notice that the power pack, even with no device plugged in, remains warm to the touch; that's positive evidence that the device continues to draw power. However, the drain is minimal.


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does this have an internal battery?

No, this unit must be plugged into the wall.