No, a toaster would not work if the entire cord was made of plastic. The power cord of a toaster, like most electrical appliances, needs to have conductive materials to carry electric current from the power source to the appliance's internal components. Plastic is an insulator, meaning it does not conduct electricity, so it cannot transmit the necessary electrical power to the toaster.
To function properly and safely, a toaster's power cord must be made of a conductive material like copper or other metal wires that allow the flow of electricity from the outlet to the toaster's heating elements and other electrical components.
In addition to being non-conductive, a plastic power cord would be a significant safety hazard. It could easily melt or catch fire when subjected to the high electrical currents required to operate a toaster. Therefore, toasters and other electrical appliances use specially designed power cords made of conductive materials with insulating coatings to ensure proper electrical conductivity and safety during use.