Electronic equipment requiring dc power must adjust the ac input to a usable level with transformers or switching transistors and use a rectifier stage to convert the ac to dc.
Self-contained machines such as fryers for fast-food restaurants, cook-and-hold ovens, and bakery equipment usually employ a simple automatic controller.
Polyamide-imides are engineering thermoplastics characterized by excellent dimensional stability, high strength at high temperature, and good impact resistance.