noun · a gauge or display showing the amount of remaining charge in a battery

手机右上角的电量表显示电池快没电了。

a scientific instrument used for measuring electric charge or quantity of electricity

实验员使用电量表记录电解过程中的电荷变化。

noun · an instrument used to measure the total amount of electricity consumed by a building or circuit

这栋旧楼的电量表安装在楼梯间。