功率的瓦特数等于安培数乘以伏特数的积。

Power in watts equals the product of amperes times volts.

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每当父亲测量电压的时候，男孩就会自愿帮忙读出伏特数。

Every time when his father measured the voltage, the boy volunteered to help read how many volts it was.

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用万能表测量并记下表E2-2中输入量和输出量的有效值（伏特数）。

Using the multimeter, measure and record the rms values of the input as well as the output (volts) in table E2-2.

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