 by George V. Hart & Sammie Hart Chapter One
Ohm's Law
The rate of the flow of the current is equal to electromotive force divided by resistance.
I = Intensity of Current = Amperes
E = Electromotive Force = Volts
R = Resistance= Ohms
P = Power= Watts
The three basic Ohm's law formulas are:
Below is a chart containing the formulas related to Ohm's law. To use the chart, from the center circle, select the value you need to find, I (Amps), R (Ohms), E (Volts) or P (Watts). Then select the formula containing the values you know from the corresponding chart quadrant.
 
Example:
An electric appliance is rated at 1200 Watts, and is connected to 120 Volts. How much current will it draw?
 
What is the Resistance of the same appliance?
 
In the preceding example, we know the following rules:
I = amps = 10
E = amps = 120
R = ohms = 12
P = watts = 1200
We can now see how the twelve formulas in the Ohm's Law chart can be applied.
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