A slow cooker is basically used for cooking of food by simmering them at low temperature over many hours without any constant monitoring. The chinese use the slow cooker to make soups and simmering of chinese herbal concoction as it takes hour for the herbs to release their elements.
The inside of the slow cooker is basically made of ceramic pot to retain the heat over a long period of time and the heat in a slow cooker can be set to low, medium and high.Although many people thought the slow cooker simmering food for such long hour must have consumed a lot of electricity, the truth is using a slow cooker only consume 250 watts of power compared to simmering food in the oven which consume 4000 watts of power.
|Ceramics pot inside of Slow Cooker|
However there is one drawback of slow cooker, according to Wikipedia some vitamins and other trace nutrient particularly from vegetable is lost during cooking in slow cooker.This is due to enzyme action and heat degradation.
Slow cooker are also an inexpensive gadget which can be bought at below $100 and can last many years if well taken care off. My first slow cooker was bought 30 years ago and is still working like new.