Modern appliances aren’t able to be turned off without disconnecting them. If you think you’ve switched off your appliances, they’re in standby mode waiting for signals coming from the remote, or the clock.
There is a chance that computers will keep a small portion of the motherboard running waiting for a signal to wake up via the primary switch keyboard, mouse , or the network.
In most cases, all you can do to determine is to connect an electrical meter to the outlet and the wall socket to determine what power is being used while the appliance is “off”.
It is claimed that the clock inside the microwave oven consumes more power than an oven. The clock operates 24/7 while the oven is only be idle for a few minutes each day.