He came up with Ohm Sense, an iPhone app that will take a picture of a resistor and calculate the value based on the color bands. It’s a great tool that we wish we had when we were starting out.

He came up with Ohm Sense, an iPhone app that will take a picture of a resistor and calculate the value based on the color bands. It’s a great tool that we wish we had when we were starting out.

These color bands and the necessary orientation to read them are universal, no matter the resistor brand. In the event you come across a five-band resistor, it reads the same except as a three ...

Color band Before you can test a resistor, you need to know its strength and tolerance. Resistors are color-coded. If you look at a resistor, one end should have a gold, silver, or white band.