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Power = Voltage * Current
Watts = volts * amps
So for your 100W light bulb assuming it's on a 110 circuit
P = E * I --> using some algebra I = P / E or I = 100W / 110V
or approximately 1amp per 100 W bulb.
For HorsePower 1hp = 750W approximately
so 3/4 hp = 3/4 * 750 = 562.5 watts ignoring start up surge current
now converting 562 watts assuming it on a 110V circuit
I = P / E or 562 / 110 or roughly 5 amps