testing 4.8 volt flight pack
08-23-2004 | 04:43 PM
#1
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From: Montpelier,
OH
testing 4.8 volt flight pack
I would like to use a digital multimeter that I have. What resistor should I use to put the right load on the battery pack to check it?
08-23-2004 | 05:03 PM
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From: Laurel, MD,
RE: testing 4.8 volt flight pack
I think you want about 100-200ma of current. (if someone corrects the current value, then just adjust the following math)
V = I R so
R = V / I so
R = 4.8volts / .2amps round a little
R = 5v / .2amps = 25ohm
V = I R so
R = V / I so
R = 4.8volts / .2amps round a little
R = 5v / .2amps = 25ohm
08-24-2004 | 05:52 PM
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From: Toronto, ON, CANADA
RE: testing 4.8 volt flight pack
Probably does not need to be said, but in case it's not obvious, you need to create the complete circuit with just the resistor, then use the multimeter to test the voltage accross the resistor *in parallel* with the resistor... you are not achieving anuthing by testing the voltage in series with the resistor..... (the volt-meter by definition has a very high internal resistance (very very high....), thus, testing in series with the resistor is pretty much the same as testing the battery without the resistor at all....
gus
gus
