Ammeter current to be measured deflects the moving magnet. Since the ammeter shunt has a very low resistance, mistakenly wiring the ammeter in parallel with a voltage source will cause a short circuit, at best blowing a fuse, possibly damaging the instrument and wiring, and exposing an observer to injury. In AC circuits, a current transformer converts the magnetic field around a conductor into a small AC current, typically either or at full rated current, that can be easily read by a meter. In a similar way, accurate AC/DC non-contact ammeters have been constructed using Hall effect magnetic field sensors. A
Electrical Artificer closure 1998 an amount of EA's were trained in the Irish Army Apprentice School and transferred to the Naval Service on completion of training. Rank on completion of training is 'Able EA', followed by promotion based on experience and training to 'Leading EA', 'Petty Officer EA' and 'Chief Petty Officer EA'. The highest possible rank is 'Warrant Officer EA' of which there is only one in the Irish Naval Service Electrical Artificer An Electrical Artificer (EA) is an electrical technician competent in the electrical maintenance of ship's machinery such as engines and generators. This was originally a Royal Navy term