When running and not in sleep mode the 21.5" iMac uses 205 watts of power. The 27" iMac uses 310 watts. In sleep mode they each use around 2 watts.
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.
45 watts
Hoovers use 1000 - 2000 watts
Abut 20 watts.
189 watts
25 watts.
650 watts
About 10 watts
it may use 15 to 25 watts
Usually about 1200 to 1500 watts.
250 Watts.
they use around about 55 watts for each headlight.