ELI5- how do rice cookers know how long to cook the rice for no matter the different quantities
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The amount of time a rice cooker operates is often based on the amount of water which is added.
Rice cookers are extremely simple. They contain a piece of metal which is magnetic but will become non-magnetic when heated above the boiling temperature of water. That metal is used to complete an electric circuit that powers the heating element, and is exposed to the water within the rice cooker. The cooker will heat the water which will never exceed the boiling point while there is water left, and when the water runs out the temperature inside will begin to rise. That causes the metal to stop being magnetic which releases the electrical circuit which powers the heating element, completing the cooking of the rice without it being too wet and before it starts to burn.
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