Why pop-up toasters know when to stop

Transcript

Inside, electric current flows through the heating elements, turning them red hot and sending heat toward the bread. Older toasters often use a bimetal strip or thermostat, while some newer models use a timer, capacitor, or sensor-based control to decide when the cycle ends. At the same moment, a latch holds the carriage down against a spring, and when the mechanism releases, the spring pops the toast up. If the lever will not stay down, crumbs or dirty contacts can be part of the problem, so a careful clean is the simplest doneness tip to try first.