標題: 有關phy 的問題唔明.... [打印本頁]

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作者: 少人最好    時間: 2009-2-25 19:55     標題: 有關phy 的問題唔明....

Four kilowatts of power is transmitted through cables of total resistance 5. Calculate the power loss in the cables if it is transmitted at 200V.

點解呢條問題唔可以用P=V^2/R

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