The amp draw... Depends on the source
If you are running off 120 volts via the brick than 33 watts around 1/3 amp at 120 volts allowing some conversion loss.
At 12 volts it is 10/3 (or 3 1/3 amp) since you need to do a DC/DC conversion to 19 volt, and at 19 volt it is about 1 1/2
In a DC circuit watts = Volts*amps, so AMPS = Watts/Volts
In an AC circuit Watts = Volts * Amps * Power factor (Takes a Kill-a-watt to find that).
And conversion loss Ac to DC, ro DC to DC is 10-20 percent.
Does this help?d
For reference, this is like hour one of the AC-Theory class I had to take to get certified once.
