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。

youdao

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。

youdao

The counting expression reflects the general conditions of the useful power of the centrifugal mill, and it proves the feasibility and reason of the expression.

计算表达式基本反映了离心磨矿机有用功率的总体情况，说明其表达式合理可行。

youdao

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