CALCULATING WITH OHM'S LAW

A. When Volts and OHMS are known:

Amperes = Volts
---------
OHMS		 of I = E
-----
R

Example: Find the current of a 120 volt circuit with a resistance of 60 OHMS.

I = E
-----
R		 = 120
------
60		 = 2 Amperes

B. When Watts and Volts are known:

Amperes = Watts
----------
Volts		 or I = P
------
E

Example: A 120 Volt Circuit has a 1440 Watt Load. Determine the current.

I = P
---------
E		 = 1440
---------
120		 =12 Amperes

C. When OHMS and Watts are known:

Example: A circuit consumes 625 watts through a 12.75 OHM resistor. Determine the current.

Notes:
A. One Electrical Horsepower = 746 watts. Electric Motors are rated in horsepower.
B. One kilowatt = 1000 watts. Generators are rated in kilowatts.