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电动机M接上2V的电压,没转,此时它两端的电流为0.5A,当接上24V的电压...

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电动机M接上2V的电压,没转,此时它两端的电流为0.5A,当接上24V的电压...
电动机M接上2V的电压,没转,此时它两端的电流为0.5A,当接上24V的电压后正常运转,此时两端的电流为2A,求M的输出功率
很容易求出电动机M的内阻r=4Ω,求M的热功率时究竟是用未转动时的电流还是转动时的电流?
电动机M接上2V的电压,没转,此时它两端的电流为0.5A,当接上24V的电压...
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电动机M接上2V的电压,没转,此时它两端的电流为0.5A,当接上24V的电压... 一截面积为2.5mm2的绝缘铜芯线,当给它的两端接上3V电压后,测量通过这盘导线的电流 微型吸尘器的直流电动机的内阻一定,当加上0.3V的电压时,通过的电流为0.3A,此时电机不转.当加在电动机两端的电压为2 请问一个钳位二极管的负极接上+5V电压,如果此时在它正极也接上一个-12V电压,会出现什么后果? 一电阻器两端的电压为8V时,通过它的电流为0.4A,当它电压为6V时,该电阻器的电阻为多大?此时通过它的电流为多少?(不 某电动机线圈电阻为1欧姆,当它两端所加电压为2V时,电动机正常工作,通过它的电流为0.8A,电动机工作 有一直流电动机,电枢电阻为0.5,在电动机两端的电压为220V,当电动机正常工作时通过电枢的电流为20A, 电动机的电阻为5欧,两端所加电压为6v,此时电流为0.4a 求电动机的电功率和热功率分 一段导体,当它的两端的电压为2V时,通过它的电流为0.2A;当它两端的电压提高到6V时,通过它的电流变为 A,电阻将 ; 一个玩具车的电动机,当把它接入0.2V电压的电路时,电动机不转,测得流过电动机的电流是0.4A,此时能量转化是电能转化为 一段导体两端的电压为2V他的电流为0.5A 当2V的电压增加到4V时电阻值为多少 一段导体两端电压为2V时,导体中的电流是0.5A,该导体的电阻是 ______Ω;若它两端的电压为0V时,那么此时导体中