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Chaji ya umeme
Chaji ya umeme ni tabia ya mata na kila kitu huwa na chaji aina mbili ndani yake. Chaji hizi mbili ni kinyume zinaitwa chaji hasi na chaji chanya. Mara nyingi chaji haionekani kwa sababu hizi aina mbili za chaji zinajibatilishana. Lakini kama idadi ya elektroni ndani ya kitu ina upungufu au ziada kulingana na hali ya kawaida tunaona kitu hiki kina chaji, ama chanya au hasi.
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