Calculate the value of a load resistor for a Light Emitting Diode (LED) based on supply voltage and LED characteristics. This application contains a number of standard LED products to choose from. After the value of the load resistor is calculated, a table of standard resistor values can be displayed so that the closest resistor value may be selected for the intended application. Select from a variety of Power Supply types and enter the transformer voltage and power supply load. This application will calculate the values for diodes, capacitors, output voltage and load current.
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This video describes Resistor Color Codes and how to read them. It relates Resistor Color Codes to scientific numbers and engineering notation.