请问
初二下学期有哪些定律和公式
人气：132 ℃ 时间：2019-08-22 20:49:21
解答
欧姆定律：I=U/R U=IR R=U/I
计算电能：P=W/t
电功率的测量：P=UI=W/t=U^2/R=I^2R
焦耳定律：Q=I^2Rt 【当Q=W的时候,Q=W=Pt=UIt=U^2/Rt=I^2Rt】
电磁波：С=λf 【С：波速 λ：波长 f：频率】
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