Limiting current through a LED

105

01:10:03

A yellow LED needing around 1.9V (at 20 mA current) and with power source of 5V, needs resistor of at least 155 Ohm, implementing Ohms law:

(5V - 1.9V) / 0.02A = 155 Ohm

As 155 Ohm resistors do not exists, use 220 Ohm resistor instead.

Source (Ben Eater):
youtube.com/watch?v=CdqvY_vY1XA

published 6 years ago

Bushmills

6 years ago

There are also 180 Ohm resistors

LeButch

6 years ago

LEDs can glow really bright, so I just use 1KOhm by default, which is still bright enough and saves calculation time.

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