In a theoretically frictionless, or ideal, machine, the work input and work output are equal, and the efficiency would be 1, or 100%.
理论上，一个无摩擦力的，或者说是理想的机器，输入和输出的功相等，因此效率是1，或者说是100%。
In dc-dc converts, the average dc output voltage must be controlled to equal a desired level, though the input voltage and the output load may fluctuate.
对于直流-直流变流器，虽然输入电压和输出负载会波动，直流输出电压必须控制在一个希望的水平。
In this case, the output voltage variations will be equal and opposite at the positive and negative outputs.
这时，输出正负电压始终对称，变化量相等。
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