The iMac is very energy efficient. A typical iMac will draw around 150-200 watts when in use so you can easily connect 8 iMacs to a 20 amp circuit. This would equate to a 80% draw on the circuit. I would not recommend any more than 8. That is assuming nothing else is on that circuit.
Hoovers use 1000 - 2000 watts
Abut 20 watts.
25 watts.
it may use 15 to 25 watts
Usually about 1200 to 1500 watts.
they use around about 55 watts for each headlight.
3/4 of watts
About 400 watts when cycled on
I read somewhere that it's 100 watts.
Not very many, probably less than 20 watts.
A small one 100 watts, a large one 1000 watts or more.