Comments by "George Reynolds" (@karhukivi) on "How A Car Battery Works - basic working principle" video.

  1. A dead battery has a high internal resistance even though the terminal voltage on open circuit stays at 12V. To test a battery you have to load it i.e. draw a significant current from it. You need a new battery, most likely.
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  2.  @captainprototype187  I'm presuming you are talking about a lead-acid (i.e. car-type) batttery or a lead gel-cell? A 12V car headlight (55W) connected to the battery should light for 3 minutes without going dim, and the voltage should still read 12V. If the light goes dim and the voltage drops below 10V then it is the battery that is failing. If this test is OK, then perhaps there is a fault elsewhere in the scooter. Garages also have testers which put a heavy load (100A) to mimic a starter motor load, and that shows up a battery fault immediately. Good luck!
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  3. You'll have to talk to Benjamin Franklin about that, he called it wrong and they only found out the electron was negative 150 years later! Makes no difference to an electrician who works with AC. It only matters for electrochemistry, gas discharge tubes and magnets. Physicists who work with those things have no problem using an old convention, just like changing units.
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  4. It makes no difference to electronics or electronic design. No difference to an electrician either. It really only matters when dealing with magnetics, electrochemistry and gas discharge tubes. The "convention" is embedded in the symbols, and very confusing to switch a student from one system to another. Blame Benjamin Franklin for calling it wrong 150 years before the electron was found to be negative!
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