Re: voltage divider or series current resistor
- From: "tempus fugit" <toccata@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 5 Mar 2007 14:16:57 -0500
An LED MUST have a series resistor to limit the current or it will burn out
in a fee milliseconds. It's not a question of lowering the voltage, it's one
of limiting the current to a safe value. LED's need a current of 10-20mA
through them to glow fairly brightly, so select a resistor for each LED to
supply this.
"NJM" <guitchess@xxxxxxxxxxx> wrote in message
news:op.top9lam6kz0nd4@xxxxxxx
I am just a beginner so forgive me if this question is stupid.
On a simple circuit, like 2 LEDs with a 12v supply, which would be better,
a voltage divider to lower the voltage or a series resistor to restrict
the current? Or am I completly wrong in my understanding of a voltage
divider?
Please correct me if I am wrong, but it seems the divider would actually
waste some energy because it is being sent to ground.
What is the determining factor in deciding which to use?
Is the reason a series resistor with LEDs because the LED has a resistance
of its own therefore creating a sort of divider?
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