Compute electrical energy in kWh, MJ or J from power and duration, and convert between the common energy units.
输入功率 P(瓦)与用电时长 t(小时),求电能(千瓦时)。
| Item | Formula / Rule | Source / Standard |
|---|---|---|
| Energy calculation | E = P × t, with unit conversion of 1 kWh to 3.6 MJ. | ISO 80000-5:2019 & IEC 60050-131:2013 |
| Standby power | Standby power is measured by the IEC 62301 method; annual standby consumption is not negligible. | IEC 62301:2011, measurement of standby power |
| Standby limit | Many jurisdictions require household appliance standby power not to exceed 0.5 W. | IEC 62301:2011 & EU Ecodesign Regulation 1275/2008 |