# Resistors A resistor is an electrical component used to create resistance in the flow of an electrical current. The amount of resistance a resistor has is measured in ohms. Resistors are important as supply too much voltage to a component you can completely destroy it. Resistors can be used to prevent this with just a little bit of math. To make calculations easier, I have linked 2 tools to help you calculate exactly what you need and what you have. [https://ohmslawcalculator.com/ohms-law-calculator](https://ohmslawcalculator.com/ohms-law-calculator) [https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-code](https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-resistor-color-code) **Read the color bands from left to right.** The colors on the first 2 or 3 bands correspond to numbers from 0 to 9, which represent the significant digits of the resistor's ohmic value. The last band gives the multiplier. For example, a resistor with brown, green and green bands is rated at 15 mega-ohms (15,000,000 ohms). The code is as follows:[\[2\]](https://www.wikihow.com/Identify-Resistors#_note-2) - Black: 0 significant digit, multiplier of 1 - Brown: 1 significant digit, multiplier of 10 - Red: 2 significant digit, multiplier of 100 - Orange: 3 significant digit, multiplier of 1,000 (kilo) - Yellow: 4 significant digit, multiplier of 10,000 (10 kilo) - Green: 5 significant digit, multiplier of 100,000 (mega) - Blue: 6 significant digit, multiplier of 1,000,000 (10 mega) - Violet: 7 significant digit - Gray: 8 significant digit - White: 9 significant digit - Gold: multiplier of 1/10 - Silver: multiplier of 1/100 [![image.png](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/scaled-1680-/KFHimage.png)](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/KFHimage.png) [![image.png](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/scaled-1680-/YZpimage.png)](https://scil-wiki.su.edu/uploads/images/gallery/2026-06/YZpimage.png)