Ohm's Law on Bald Engineer

AddOhms #8: LEDs and Current Limiting Resistors

Mon, 10 Feb 2014 12:00:49 +0000

The idea for AddOhms #8 has been around for quite some time. I’m always trying to find ways to explain why current limiting resistors are necessary. So while working in the shop one day, I decided to play with some LEDs and a bench-power supply. Then I decided to record what happens.

Unlike Speed Limits, Ohm's Law isn't a Suggestion

Tue, 31 Dec 2013 12:00:51 +0000

Getting started with electronics always involves a discussion of Ohm’s Law. What is this mysterious sounding law and how can you use it when building electronic projects? One the main uses for Ohm’s Law in your projects is to calculate the resistor value needed for a LED. This article takes a look at what Ohm’s Law is and how to use it with LEDs. Overview Ohm’s Law is really a mathematical rule based on two points. In electronics those two points have a voltage across them (aka potential difference). The amount of current that flows from one point to the other, is going to depend on the resistance between those points. So Ohm’s law says that the Resistance of a device is equal to the Voltage Across it divided by the Current that Flows through it. The formula looks like this:

Engineering Resource: Web Equation

Fri, 17 Aug 2012 09:05:59 +0000

Documentation, Documentation. Documentation. It is always critical to document progress is a log book. If using an electronic tool like Evernote or a Blog, it can be difficult to document equations or calculations you’ve made in a project. Vision Objects has put together a demo tool that allows for writing your equation in freehand which then uses image recognition to covert into LaTeX code.