"Amps. By Multiplication:"

From: Anonymous

Dividing shortcut, Hey if your like me, when you’re trying to figure out how many
amps. a piece of Equipment draws, long division is a hassle and I usually get it wrong, but multiplying is a lot easier.
Well with this shortcut you can use multiplication instead of division to divide watts by volts.
Example: usual way to figure how many amps. in 5000 watts with a voltage of 120 volts is to divide 5000/120=41.66 amps.

Shortcut : You multiply the watts 5000 by the reciprocal of 120 which will give you the same answer as dividing.
The reciprocals for these voltages are 120=.008333
208=.004807
230=.004347
277=.003610
480=.002083
Shortcut Example:
watts x reciprocal=amps
5000 x .008333=41.66
5000 x .004807=24.03
5000 x .004347=21.73
5000 x .003610=18.05
5000 x .002083=10.41

By the way to get the reciprocal of a number divide “1” by the number you want the
reciprocal of the result is the reciprocal.

If you have any Tricks of the Trade you would like to add or if you have any comments please feel free to Email E.T.E..