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Como descobrir qual pino da tomada na parede é a fase o o neutro. Quando você põem uma das pontas de prova na parede você está aterrando ela, o que cria uma diferença de potencial , ainda que não perfeito, mas o suficiente para o multímetro detectar algum valor elevado se você liga-ló na fase , a diferença o multímetro lhe dá. E você descobre que aquele pino é a sua fase. #Eletronica
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