• Iv:经过过孔的电流(A)
• J:体电流密度(Current Density,A/m2),流过某横截面积的电流
• V:电压(V)
• P:功耗密度(Power Density,W/m3),流过导体单位体积的功耗
• Power:某一层的总功耗(W),I2*R
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