The useful power in ac circuit also depends on the current and voltage in the circuit.

交流电路中的有用功率还取决于该电路中的电流和电压。

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If even a small proportion of this wasted heat could be converted to useful power, it would be a good thing.

如果把浪费掉的很小的一部分热能转换为有用的能量，这都是件好事。

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Carry the analyse in theory and calculate on useful power and thermal waste of conduct heating machine;

对感应加热器的电效率和热损耗功率进行了理论分析和计算；

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Similarly, attaching thermoelectric devices to the flues of power plants could generate more useful power.

ECONOMIST: Thermoelectrics

Consider that for every BTU of coal or natural gas burned in a combustion turbine only 35 percent of that is converted into useful power.

FORBES: Recycling Wasted Heat and Power Could Clear the Air

Such technology could be useful in power-sucking data centers and handheld devices with limited batter life, such as smartphone sand tablets, obviously.

FORBES: Intel Demonstrates Solar-Powered Processor