![](/_next/image?url=%2F_next%2Fstatic%2Fmedia%2Fobject-placeholder.2e86f75c.jpg&w=3840&q=75)
Portable potentiometer
![](/_next/image?url=https%3A%2F%2Fres.cloudinary.com%2Fmitmuseum%2Fimage%2Fupload%2Ft_800%2Fmedia-internal%2F1983.001.007_1.jpg&w=3840&q=75)
Description
MIT Property Tag # E238
Potentiometers are instruments that measure the voltage (or potential difference) in a circuit by measuring an unknown voltage with a known one from a standard cell (a battery that produced a known and stable voltage).