My flat is fitted with switchable sockets as per below:
Please settle an argument a friend and I are having: if a socket is switched "on", is it wasting electricity if nothing is actually plugged into it? If so, any idea how much?
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No. With nothing plugged in there is no circuit, so no current can flow.
An exception to this is if the socket or the switch has an indicator light - usually a neon one - that is illuminated when the switch is on. In that case the light will use a (very small) amount of power.