Killing a Led

173

02:26:36

By variing the resistor we could increase the current, so that the led gives a last smoking signal :)
Please kids don't try this at kome ;)
What we learn from this :
- allways limit the current ! 
20 mA is a good value
To calculate the resistors value we use the fixed values
Maximum current: 20 mA
LEDs voltage : 2 V

So we can calculate 
Our block batterie that we use has 9 Volt.
The Led takes 2 Volt, so we need to handle 9 V - 2 V= 7 V
at the resistor.
The current is calculated by Ohms Law
I = U / R
in our example 
0,02 A = 7 V / ? Ohm

This gives us 350 Ohm as the resitors value.

published 10 years ago

Karsten

10 years ago

variing with y, kome with h, allways with one l, batterie is german, the battery delivers 9V, don't think you can use U as a placeholder for voltage in English, you could've written the equation down as R = V / I so it is easier to understand and when you desperately want to say resistor's value then insert an ' between "resistor" and "s"

rich11292000

10 years ago

Go download EVERY WORD if you want to beat on people for their grammar. Lol.

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.