Bu uzatma kablosu çok kısa. - This extension cord is too short.
Bu uzatma kablosu bana tehlikeli gibi görüyor. Nereden yıprandığını görüyor musun? - That extension cord looks dangerous to me. You see where it's frayed there?
Definition of extension cord in English English dictionary
An electrical cord with a plug one end, and a single socket or a multi-port socket at the other end, used for powering one or more devices at a distance, too far from the wall outlet to be reached by the normal cords of the device or devices. (slang: trip cord)
An insulated, flexible electric wire fitted with a plug at one end and one or more outlets on the other, allowing one to plug in devices whose cords are not long enough to reach a wall outlet