nuckolls.bob(at)aeroelect
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 Posted: Sun Jan 29, 2012 9:06 am Post subject: Interesting data point |
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I've built a court-room demonstrator for an
upcoming trial wherein it was useful to show
the relative speed with which fuses and breakers
react to the same level of stress.
I elected to try a 6v alkaline lantern battery
to power the handy-dandy fuse-blower and breaker-
popper but had never investigated the internal
impedance of these devices. I can report that
the hard-fault current of these devices is on
the order of 20 amps.
This means that the internal impedance of a new
battery is approximately 6/20 = 300 milliohms.
So if one sets a wasted energy limit of 10% for
loading this battery, you will want your load
to be no greater than 9 x 300 = 2.7 ohms. This
translates into a 2.2 amp load.
I think most lantern bulbs are on the order of
.5 amps for 3 watts. This suggests a usage
efficiency on a new battery of about 97%.
Not bad. I'll cap-check one of those batteries
one day and report the findings.
Bob . . .
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