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?

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