How Electron Flow Occurs in Electronic Circuits
Why Schematics are Used to Build Electronic Circuits
How Current is Determined by the Electronic Circuit
How Resistors Work in Electronic Circuits
Color Codes for Resistors in Electronic Circuits
How Capacitors Work in Electronic Circuits
How to Store a Charge in a Capacitor
Inductors & Their Function
How to Measure Components in an Electronic Circuit
How Printed Circuit Boards Work
What Tools are Needed to Work with Electronics
Differences in Wire Gauges
How to Strip Wires Using Wire Strippers
How to Safely Work with Electronics
How to Power an Electronic Circuit
How to Measure Voltage in an Electronic Circuit
How to Measure Current in a Circuit
How to Measure Resistance in an Electronic Circuit
How Soldering Irons Work
How to Tin a Soldering Iron
How to Solder Electronic Leads Together
How to Use Perfboard to Make an Electronic Circuit
How to De-solder Electronic Connections
How to Diagnose Cold Solder Connections
How to Reflow a Connection in an Electronic Circuit
How to Use a Breadboard to Prototype a Circuit Board
How a Light Emitting Diode Works
Uses & Operation of a Fuse
How to Use Integrated Circuits
How Transistors Work in an Electronic Circuit
How a Variable Resistor Works in an Electronic Circuit
How Does a Series Circuit Work
How to Compute Resistor Resistance in an Electronic Circuit
How Resistors Work in Parallel Circuits
How Schematics are Used in Electronics
How Switches Open & Close Circuits
Electronic Circuits in Garage Door Openers
How to Make a Schematic for Your Electronic Circuit Project
How to Test a Prototype of Your Electronic Circuit
How to Use Perfboard to Build an Electronic Circuit
Practical Operation of Electronic Circuit Indicators
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" Hello! This is Ross on behalf of expertvillage.com. What is a diode? This is a light emitting diode called an LED still its like a regular diode and in sense that this is its schematic symbol except that we are going to shoot the couple of light beams out here… here. It is giving off light. Current only flows through one way. This is the cathode here and this is the anode side. When this side is more positive, when the anode side is more positive than the cathode side the current will flow through. So it allows current only flow in one direction like a valve. Here I have a circuit setup, I am going to add the light emitting diode. We not going to see any light, but I have power to it so what's going on. On the LED, there is a flat side here that flat side is the cathode, which needs to be more negative, but my circuit up here is the positive and this is the negative, so current does not flow and I am going to pull it out. I am going to turn it around to 80 degrees now the cathode will be on the negative and there we go it lights up. So now current is flowing through it, but since this is an LED it gives off light when current flows through it and that’s a diode."
eHow Article: How a Light Emitting Diode Works
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Comments
bdlang said
on 12/14/2008 Nice tutorial, especially detailing the anode / cathode and explaining which direction current flows. I suggest considering adding an additional detail as to why a resistor is required when using an LED (since it's plain to see you have one inline on your breadboard).