Subject:
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(no subject)
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Fri, 13 Nov 1998 09:46:59 GMT
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Original-From:
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r.farnhill@%spamless%bssl.co.uk
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Viewed:
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1969 times
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Hi all,
Ok now i know how to charge my NiCad batteries i have laying around.
Thanks to Brett and Scott for the info.
I have been doing my sums to try and work out the series resistor i need to
charge a 2Amp NiCad at C/10, but my figures dont seem right.
Iam using an old laptop power adapter rated at 15V @ 4.4A, ok so here goes.
2A
charge current needed for nicad = ------- = 200mA.
10
15volts
Resistor needed = ---------- = 75 Ohms
0.2A
power rating of resistor = 15Volts * 200mA = 3Watts
Series resistor needed = 75 Ohms @ 3 Watts.
-----------------------
-------
The 75 Ohms bit seems reasonable to me but 3Watts must be way to much.
could anyone show me where i have gone wrong.
Thanks Russ.
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