In May of 2025, the Vernier Variable Load (VES-VL) was updated to a new design. The new version has two rotary switches that allow the user to set the resistance to even resistance values from 2 to 200 Ω. The Variable Load supports up to 300 mA of current and comes with a replaceable 365 mA fuse. (A spare fuse is included inside the case.)

This version of the Variable Load also has an internal switch with two settings—GDX-NRG and OTHER. (The unit is shipped with the switch in the GDX-NRG position.)

  • When the switch is in the GDX-NRG position, the resistance of the Variable Load is actually 1-Ω lower than the resistance specified by the dials on the box. This is done to account for the 1-Ω resistor built into our energy sensors, Go Direct® Energy Sensor (GDX-NRG) and Vernier Energy Sensor (VES-BTA).
  • When the switch is in the OTHER position, the resistance of the device matches the resistance specified by the dials on the box.

If you want to use the Variable Load for general experiments or projects, you should set the switch to the OTHER setting; however, with only a 1-Ω difference, it rarely will matter at all.

Related Articles

Published: June 21, 2025. Updated: November 20, 2025.