Third Week

More about Ohm's Law

How to read a datasheet (PDF)

Common Symbols Used in Electronic Schematics

How to make a standalone Ardy

From Greg Shakar's notes :
To calculate the value for a current limiting resistor for an LED: R = (Vs - Vf) / If
Where:
Vs = your source Voltage (usually 5 Volts for pcomp class).
Vf = the typical LED forward Voltage, find that in the LED's data sheet.
If = the typical LED forward Current, find that in the LED's data sheet.