TONY BROOKS

‘Even a small car bat­tery can de­liver many hun­dreds of amps, but maybe not for long’

Canal Boat - - Directory Surveyor & Examiner -

Tech­ni­cal Con­sul­tant I AM SURE many of us thought we had left all the science stuff be­hind when we fin­ished school, but when talk­ing to peo­ple or ask­ing for ad­vice, there is a need to use the cor­rect units. The most com­mon prob­lem is re­fer­ring to bat­ter­ies as, for ex­am­ple, a ‘100-amp’ bat­tery.

There is no such thing, even a small car bat­tery can de­liver many hun­dreds of amps, maybe not for long but long enough to do some dam­age.

What they usu­ally mean is 100-amp hours and that is very dif­fer­ent. This more or less tells us it can de­liver 100 amps for one hour, 200 amps half an hour, and 50 amps for two hours and so on. Amp Hours (Ah) on a bat­tery tells us how much elec­tric­ity a bat­tery can hold when new and fully charged, but that ca­pac­ity will re­duce over time.

( Ed’s note) If you have the time, there’s an in­ter­est­ing range of ta­bles at rapidta­bles.com (look un­der elec­tri­cal units in par­tic­u­lar).

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