potentiometer slider

例句：

1. 1. The potentiometer is used to adjust the brightness of the display.
   电位计用于调整显示器的亮度。
2. 2. The potentiometer slider allows you to fine-tune the volume control.
   电位计滑块允许你精细调整音量控制。
3. 3. In the circuit diagram, the potentiometer slider is shown as a small square with a dot in the center.
   电路图中，电位计滑块被表示为一个带有中心小点的正方形。