RedCrab Math Tutorial
 


Resistor and Conductance
Ohm's Law
Specific Resistivity and Conductance
Resistors in Series
Resistors in Parallel
Wire Voltage Loss
Electrical Power
 
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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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