| 摘要 |
A voltage measurement device measures the voltage (S11), and creates voltage information on the basis of the measured voltage data. An approximation formula for obtaining the voltage is devised as the voltage information (S12). Subsequently, the voltage measurement device sends the devised approximation formula to a current measurement device via an interface unit (S13). The current measurement device receives the approximation formula sent by the voltage measurement device via the interface unit (S15). Then, the current measurement device measures the current (S18). The current measurement device applies the time in which the current was measured to the approximation formula, and obtains, from the approximation formula, the voltage at the time in which the current measurement device measured the current (S19). Then, the obtained voltage is multiplied by the measured current to obtain the power (S20). |
