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E and M : About power - Yahoo!知識+
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日期:2024-08-18
When we needed to calculate the power loss, why don't we use P=IV, but P=I^2R or v^2/R?Also in a transformer, we calculate the current in the secondary coil by Vs/Vp=Np/Ns, but why not V=IR (given resistance in the secondary coil) ?...看更多