The Ohm's Law 
Ohm's Law defines one of the most important rules for calculating electrical circuits. 
In its original form, it determines the resistance in ohms from a current and voltage measurement when U in volts and I in amps are known: 


Calculation of current I if U in volts and R in ohms are known: 


Calculation of the voltage U, if I in amperes and R in ohms are known: 


Example: 
Calculation of the resistance of a load at 230 volts a current of 4.5 amperes 

The example above was created with the RedCrab Calculator. The Ω symbol is optionally automatically placed after the result when the formula symbol R is calculated. 

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