为什么不能在同等时间，温度加热棒功率与温度条件

来源：蜘蛛抓取(WebSpider) 时间：2018-01-04 14:18 标签： 功率与温度的换算
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3w功率电阻长时间工作温度是多少
10-01-13 &匿名提问
　　不考虑电阻的温度系数：P=UU/R　　220V时功率为P1；12V电压下功率为P2、电流为I2：　　　　P2/P1=U2^2/U1^2　　　　P2=/(220×220)=2.9752W　　　　I2=P2/U2=0.248A　　考虑电阻的温度系数：电阻通常具有正温度系数，当电压降低以后，电阻发热量下降，温度下降，电阻值下降，所以12V低压下，电阻的功率、电流要比上述计算值大一些。
V=4.545(A) =&电阻:49.44欧 当电压12V时.电流:0.2429(A);功率:2.9149瓦(w).(I=V/R) (P=IV)
欧姆定律：R=U/I;U=IR;I=U/R电功率公式：P=UI,I=P/U当220v1000w时，功率电阻：R=U^2/P=220*220//欧姆当电压12V时的功率电流：I=U/R=12/48.4=0.A当电压12V时的功率:P=UI=12*0.25=3W
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（1）长时间工作，允许功耗2.1W（2）假定0功率温度125度（3）T=Ta+2.1*(55/3)=Ta+38.5（4）加入电压，将其功率调到2.1W，测量气温升超过38.5W，则该电阻为假3瓦，市面上的很多小厂，仅有体积相同，但没有相同的功率
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