58问答库 > 一台直流电动机的额定电压为U=110V，电枢的电阻R=0.5Ω，当它正常工作时通过的电流I=20A，若电动机正常运

一台直流电动机的额定电压为U=110V，电枢的电阻R=0.5Ω，当它正常工作时通过的电流I=20A，若电动机正常运

2025-04-03 14:08:38
推荐回答（1个）
回答（1）：

（1）电流所做的功为：
W=UIt=110×20×60 J=1.32×105 J
（2）电枢上产生的热量为：
Q=I2Rt=202×0.5×60 J=1.2×104 J
（3）根据能量守恒定律，电动机输出的机械能：
E=W-Q=1.32×105 J-1.2×104J=1.2×105 J．
答：（1）电流所做的功为1.32×105 J；
（2）电枢上产生的热量为1.2×104 J；
（3）电动机输出的机械能为1.2×105 J．

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