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。
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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