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Resistor value in the circuit
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Question
Hi,
How one can determine the appropriate value of the resistor to be used in a circuit. Like given that we have 5 volt or 9 volt input supply and it is used to power a LED. What should be the value of the resistor to control the current reaching LED?

Arduino Arduino-components-and-IDE 03-04 min 50-60 sec 18-01-20, 11:35 a.m. vijayukani

Answers:

In the tutorial we have used 220 ohm resistor. Any resistor with value < 1K ohm will work.
18-01-20, 11:44 a.m. Pratikjb11

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You may use Ohms Law and Kirchoff Law together to derive the value of the current limiting resistor. Please refer to the following articles on the same

- https://www.evilmadscientist.com/2012/resistors-for-leds/
- http://www.resistorguide.com/resistor-for-led/

In addition, there are many online calculators for doing the same too - https://ledcalculator.net/
18-01-20, 11:52 a.m. vishnuEaswaran

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