Ohm's Law

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Ohm's law is a mathematical relationship of three variables in an electronic circuit containing a resistive element. It states that the voltage across a resistive element is equal to the current passing through the resistive element times the resistance of the resistive element. The law is named after German physicist Georg Ohm, who wrote a treatise on this relationship in 1827.

In mathematical terms, this is written as:


Voltage across resistive element
Current through resistive element
Resistance of resistive element

See also