Re: Basic question about volts
From: Don Klipstein (don_at_manx.misty.com)
Date: 12/30/04
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Date: Thu, 30 Dec 2004 07:22:37 +0000 (UTC)
In article <qZmdneWPfISMOE7cRVn-1Q@speakeasy.net>, mike c wrote:
>First of all, I am completlely new to electronics and have just begun
>trying to learn, so I apoligize if this is a super simple question.
>
>I have a power source that is 5 volts. Is this 5 volts per circuit? or
>total?
>
>i.e. if I have an LED that uses 2 volts, does that only leave 3 volts
>for other items to use? i.e. could I only connect 2 2 volt LEDs?
You can use any number of LEDs. Put a 150 ohm resistor in series with
each one, and you can put any number of LED-resistor combos in parallel
with each other.
When you put items (such as LED-resistor combos) in parallel with each
other, all receive the full supply voltage.
Just don't draw more current than is available from the power supply.
Each LED-resistor combo should draw about .02 amp.
--------------------------------
You can put two 2V LEDs and a resistor in series with each other if the
resistor is 47 ohms. You can put this load in parallel with other loads
on the same power supply.
For more on resistors for LEDs, check out
http://www.misty.com/~don/ledd.html
- Don Klipstein (don@misty.com)
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