modified 5 years ago

LED with resistance

01:13:17

Find the good resistor for LED 

published 5 years ago

Robert_Kidd

5 years ago

Nominal LED current for EC is 20mA so you’re not far away. You can just tweak the resistor value or you could calculate it. To calculate, you have chosen a 9V supply, the LED will drop 3.5V so the resistor must drop 9-3.5=5.5V. Using Ohms law, V=I x R, R=V/I so R=5.5/0.02=275 Ohms. (I note you’ve altered LED working voltage from default 2V to 3.5V).

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.