An electrician, as well as a Doctor, must know his work instruments very well and give them the correct use to perform an impeccable job, one of these tools is the ammeter that is used to measure the intensity of electric currents. Ammeters have a very small internal resistance, below 1 ohm, so that their presence does not reduce the current to be measured when connected to an electrical circuit. We can say that this is one of the essential tools of the professional electrician
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