Page 11 - Electronics Starter Kit_EN

Schematic

Wiring diagram

1.5 Circuit Explanation

Red LED takes 2V, and it needs current 10-15 mA to be in a good brightness, so we cannot
connect it directly to 5V, we need a resistor in series with the LED.

To calculate the value of this resistor: 5 − 2 = 3

Then we are going to use Ohm’s Law:
= ×
3
=
0.0125
= 240 Ω

And there is no standard resistor with this value, so we are going to use the closer one which is
220 Ω.

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