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• Ohm's Law - E = IR describes the fixed relationships between voltage, current and resistance where:
E = Voltage (pressure) in volts
I = Current (flow rate) in amperes
R= Resistance (friction) in ohms.
Using the standard symbols, this relationship may be shown in three different ways, so that it is possible to determine one unknown value if the other two are known.
E = IR, R = E/I, or I = E/R
• Ohm's Law Triangle - Using this triangle makes an easy way to determine the relationship between voltage, current and resistance when making Ohm's law calculations. Just cover the unknown quantity to determine the needed calculation.• Power Equation - The amount of power used in a circuit is equal to P = IE where:
P = Power in watts
I = Current (flow rate) in amperes
E= Voltage (pressure) in volts.
As with Ohm's law this relationship may be shown in three different ways, so that it is possible to determine one unknown value if the other two are known.
P = IE , I = P/E, or E = P/I
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