Motor Electric Motor Will Not Work If Plug To An Extension Cord. But Will Work If Plug In A Wall Plug.?

Electric motor will not work if plug to an extension cord. but will work if plug in a wall plug.? - motor

I replaced the cable supplied with the engine. another cable. which is used as an extension cable. I cut the end that was not necessary. and connected to another cable. The electric motor is a sewer Agur.