watt-hour metre

例句：

1. 1. The device is designed to measure the amount of energy used in a specific period of time, often in the context of electricity consumption.
   该设备设计用于测量特定时间段内的能量使用量，通常在电力消费的背景下。
2. 2. In this case, the watt-hour metre was used to accurately record the energy consumption of the household.
   在这种情况下，瓦特小时表被用来准确记录家庭的能源消耗。
3. 3. The watt-hour metre is an essential tool for monitoring and controlling energy usage in homes and businesses.
   瓦特小时表是监测和控制家庭和企业能源使用的关键工具。