LED''s In Series.....
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That helps alot - Thank you Ray.
Tim
Original Message
From: Ray McArthur <rjmca@u...>
To: basicstamps@yahoogroups.com <basicstamps@yahoogroups.com>
Date: Sunday, April 15, 2001 9:39 PM
Subject: Re: [noparse][[/noparse]basicstamps] LED's In Series.....
>One way to look at it is the water flow analogy. If you connect four
garden
>hoses end-to-end, the same gallons/minute flows through all hoses. It
takes
>more pressure to get a given flowrate for the four hoses, because of the
>added hose resistance. Likewise, the four series LEDs each carry the same
>number of electrons/second, (which is amps), passing through each in
>sequence. The four LEDS need more pressure, (voltage), to get the 20 ma
>flow. If the LEDS were in parallel, you would need to supply 80 ma. at
less
>voltage.
>
>Hope this helps,
>Ray McArthur
>
>> Thank you Nick. Would you expound on why the circuit of four LED's only
>> needs a total of 20mA when each LED requires 20mA to be at full
>brightness?
>> This just isn't making complete sense to me yet and I'm not sure what I'm
>> missing.
>>
>
>
>
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
Tim
Original Message
From: Ray McArthur <rjmca@u...>
To: basicstamps@yahoogroups.com <basicstamps@yahoogroups.com>
Date: Sunday, April 15, 2001 9:39 PM
Subject: Re: [noparse][[/noparse]basicstamps] LED's In Series.....
>One way to look at it is the water flow analogy. If you connect four
garden
>hoses end-to-end, the same gallons/minute flows through all hoses. It
takes
>more pressure to get a given flowrate for the four hoses, because of the
>added hose resistance. Likewise, the four series LEDs each carry the same
>number of electrons/second, (which is amps), passing through each in
>sequence. The four LEDS need more pressure, (voltage), to get the 20 ma
>flow. If the LEDS were in parallel, you would need to supply 80 ma. at
less
>voltage.
>
>Hope this helps,
>Ray McArthur
>
>> Thank you Nick. Would you expound on why the circuit of four LED's only
>> needs a total of 20mA when each LED requires 20mA to be at full
>brightness?
>> This just isn't making complete sense to me yet and I'm not sure what I'm
>> missing.
>>
>
>
>
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>