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Old 20th Mar 2019, 12:06 am   #63
Uncle Bulgaria
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Join Date: May 2016
Location: Cornwall, UK.
Posts: 189
Default Re: Ferrograph 4A: Restoration advice needed

That's a great video, Lawrence! I remember in my A-level physics that I never grasped the rheostat/potential divider and their differences. That old USAF man explains it quite well.

Well, let's see - the DMM has a very high input impedance so as a 'load device' there is very little current flow, and its parallel resistance alters the other resistances very little too.

Am I on the right track? That man is so persuasive that it feels as though one understands every word, even if that may not really be the case!
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