You are late for school. Pop a toaster cake in the microwave, push some buttons, and within seconds you can have a fast and easy breakfast. Microwave ovens can heat food in seconds and cook meals in minutes. Inside the microwave is a special tube called a magnetron that changes electricity into high-frequency microwaves.
Microwaves are a form of electromagnetic energy. Microwaves cause water and food molecules to vibrate very quickly. This creates a friction that produces heat, which can cook or warm up food fast.