Ohm's Law

Georg Simon Ohm lived from 1789 - 1854 and found the mathematical 
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relationship between voltage, current and resistance in an 
electrical circuit.

E = voltage (electromotive force) [in volts]
R = resistance [in ohms]
I = current (intensity) [in amperes]


Ohm's law in formula:
---------------------
                        E               E
E = I x R          I = ----        R = ----
                        R               I
    
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Example:
--------

A voltage  E  of 24 volts is applied to a resistor  R  of 
6 ohms.
What is the current  I  through the resistor R ?

Answer: The current is equal to the voltage divided by the
        resistance.

     E              24 volts
I = ----       I = ---------           I = 4 amperes
     R               6 ohms            =============