I came across this little pearl of wisdom somewhere on the net and have found it very useful so I'm repeating it here for everyone's benefit since the whole "how many Amps?" question seems to come up rather a lot on game collecting forums.
/ = Divided By
FOR DC
746 Watts = 1 Horsepower. Always. By definition
1 Kilowatt (KW) = 1000 Watts
Watts = Volts x Amps
Amps = Watts / Volts
Volts = Watts / Amps
FOR SINGLE PHASE AC
Power Factor = Input Watts / (Volts x Amps)
Watts = Volts x Amps x Power Factor
Amps = Watts / (Volts x Power Factor)
Volts = Watts / Amps
NOTE: I can accept absolutely NO responsibility for the accuracy of this information. SO, if you end up frying you and / or your neighbors dog, don't come crying to us! A golden rule of thumb with anything electrical is: If you're unsure of what you're doing, DON'T DO IT!!