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 ...

Details Equipment [1] Light bulb [1] Bulb socket [1] Variac [1] NEMA 1-15 to banana adapter Classroom Assembly Place the variac on a horizontal surface near a power outlet. Connect the light bulb to ...