Ohm's Law

The definition of Ohm's Law is as follows:

Ohm's Law is a simple relation between the current, voltage, and resistance in a circuit.  The Current, Voltage and Resistance are independent.  If two quantities are known, the third can be found by using a simple equation.  The ohm is the standard unit of resistance, reactance and impedance.  The symbol is the Greek capital letter omega.  A resistance of 1 ohm will conduct 1 amp of current when a voltage of 1 volt is placed across it.  According to ohm's law, voltage is directly proportional to current.  An increase in voltage means increase in current and a decrease in voltage means a decrease in current.

Current = Voltage / Resistance -----> I = E / R
Voltage = Current x Resistance -----> E = I x R
Resistance = Voltage / Current ------> R = E / I

An easy way I like to remember the lettering for Ohm's Law is simple.  I take the word PIER and write it vertically.  Next to it I write the word WAVO.  To me they both resemble something to do with the beach.  You should have something like this:

P -- W
I --- A
E -- V
R -- O

Now the word WAVO is easy to associate terms to each letter.  For example:
W = Watts
A = Amps
V = Volts
O = Ohms

So with that said, if you write down this easy to remember statement you will always know that P = Watts, I = Amps, E = Volts and R = Ohms.

More information on Kirchoff's Current Law
More Information on Kirchoff's Voltage Law

This information is very helpful in studying for the NICET exam.

T-Shirt - Ohm's Law
Ohm's Law, Electrical Math and Voltage Drop Calculations