Subject:
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Re: Parts substitution
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 12 Apr 1997 15:28:44 GMT
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Original-From:
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Richard Vannoy <richardv@abac.com!stopspam!>
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Reply-To:
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richardv@abac.com(avoidspam)
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Viewed:
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1353 times
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> I have a question on the replacement of the a specific resistor. On the
> handyboard there is a 3.83K 1/8W resistor. I just received in the mail the
> last pieces for the board and was shipped a 3.83K 1/4W resistor. Is the
> wattage citical on this component.
In this case, no problem. The computation of power is simple...
Watts = Volts X Amps
and ohms law is...
Volts = Resistance X Amps
Using the traditional I = current (they say it comes from the French
word for
Intensity)
R = Resistance
E = Voltage (or Electro-Motive Force), then you
have...
RI = E or R = E/I or I = E/R, and
W = E X I
Say you use this resistor on a robot or Handyboard with 6 volts...
I = E/R = 6.0 / 3830 = 1.57 milliamps, and for power...
W = E X I = 6.0 X 1.57 milliamps = 9.4 milliwats, well below the rating
of 250 milliwatts for a 1/4W resistor.
The idea is to NOT EXCEED 1/4 watt. Less is no problem.
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Message is in Reply To:
| | Parts substitution
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| I have a question on the replacement of the a specific resistor. On the handyboard there is a 3.83K 1/8W resistor. I just received in the mail the last pieces for the board and was shipped a 3.83K 1/4W resistor. Is the wattage citical on this (...) (27 years ago, 10-Apr-97, to lugnet.robotics.handyboard)
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