A Variac looks like a sci-fi laboratory prop. For some reason, I have three of them in my shop, and yes, one is just a book end. But they do have a useful purpose. Variac is a generic trade name ...

Plug the electromagnet into the variac, and the variac into the wall outlet. Put the white iron core lifter in position under the iron core. Ensure a ring is being precooled in the dewar of LN 2.

Hi, I am trying to verify that a system can run at 50 or 60 Hz and 100 - 240 VAC. Can a Variac be used change both output frequency and voltage or just ...

Turn on the variac after making sure the light bulb is connected to the variac properly. Slowly turn the knob to increase the voltage, notice how the color of the filament changes. Return it to zero ...