Resistor Colour Code Table

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#### The mathematical formulas of Ohm’s Law

Ohm’s Law can be rewritten in three ways for calculating current, resistance, and voltage.

If a current I should flow through a resistor R, the voltage V can be calculated.

#### First Version of the (voltage) formula: V = I × R

##### If there is a voltage V across a resistor R, a current I flows through it. I can be calculated.

#### Second Version of the (current) formula: I = V / R

##### If a current I flows through a resistor, and there is a voltage V across the resistor. R can be calculated.

#### Third Version of the (resistance) formula: R = V / I

All of these variations of the so called “Ohm’s Law” are mathematically equal to one another.