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有关运放内部功耗的计算问题

请问一下正常工作时,运放的内部功耗怎么计算?

具体内部功耗和供电电源输入功率、输出负载损耗的功率还有静态功率(静态电流产生)之间是怎样的关系?供电电源的输入功率是否就是电源电压乘上负载上的电流?

另外,在供电电压是直流电,而输出是交流电时,是否讲输出交流电的有效值代入进行计算就可以,不用考虑瞬时值吗?

非常感谢!