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AeroElectric-List Digest: 1 Msgs - 06/25/18

 
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dlj04(at)josephson.com
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PostPosted: Mon Jun 25, 2018 11:29 pm    Post subject: AeroElectric-List Digest: 1 Msgs - 06/25/18 Reply with quote

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On Jun 25, 2018, at 11:30 PM, AeroElectric-List Digest Server <aeroelectric-list(at)matronics.com> wrote:

electrical problems with the bigger electrical units (120v - 460v), however
he told me that the reason this machine I was working on blew a fuse because
the battery was low(which it was dead when it came in). I explained to him
that according to my understanding of ohms law, that doesn't make sense. If

It doesn’t make sense if the load that the fuse was supplying behaves like a simple resistor, as you suggest. But you don’t know that’s the case. For instance, if the load is a motor and there wasn’t enough current to turn it, it could very well try to draw much more than rated current while stuck on one part of the commutator, unable to move to the next. A switching power supply can draw more current as the input voltage drops as it tries to maintain regulation. This happens in aircraft avionics some times, a breaker will pop in low voltage conditions because the load is trying to pull more current.


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