A thin wafer of semiconductor material used for measuring ac power and magnetic fieldstrength. Its output voltage is proportional to the current passing through it times the magnetic field perpendicular to it.

• 用来测量交流功率和磁场强度的一种半导体材料薄片（亦称大圆片），其输出电压与通过它的电流及与其垂直的磁场强度的乘积成正比。