Амперметр - прибор для измерения силы тока. Он включается в цепь последовательно, и его сопротивление должно быть много меньше сопротивления цепи. В противном случае амперметр сильно увеличит сопротивление цепи, что исказит показания прибора (то есть он покажет меньшую силу тока).
Вольтметр - прибор для измерения напряжения. Если в цепь включить вольтметр, то сопротивление цепи уменьшится. Чтобы свести это уменьшение к минимуму, следует делать сопротивление вольтметра намного большим по сравнению с сопротивлением цепи.
P.S. ник твой порадовал)))
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