Electronics/Ohm's Law

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Ohm's law describes the relationship between voltage, current, and resistance.

Voltage and current are related such that voltage is equal to current times resistance:

$V=I\cdot R$

Common units used in electronics calculations are:

V = mA × kΩ

the current going through any point in the circuit, I, will be equal to the voltage V divided by the resistance R.

In this example, the voltage across the resistor, V, will be equal to the supplied current, I, times the resistance R.

SUMMARY:

V=I times R

I=V divided by R

R=V divided by I