Fun (Techie) Question(s)...(will be continued if there is interest) This is #1: Answered
The problem is to take an extension cord (you will have to figure the gauge at some point), and wire in 2 more "sockets" (for plugs) in series or in parallel, plus 3 neon bulbs in such a way that they only light when something is...
#1: plugged into the corresponding socket &
#2: the something (appliance, light, etc) is turned on, in other words, when that portion of the circuit is closed.
The cord will be for very light rated appliances or bulbs. Nothing beyond a kilowatt althogether.
Specify extension cord wire gauge and anything else needed for the project and it's necessary rating / part number.
And most of all, have fun....and don't over think the problem ;-)