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This article is about automated rice-cooking appliances. For less automated methods of cooking rice, see rice-cooking utensils. For the siêu xe and motorcycle term, see Rice burner.
A rice cooker or rice steamer is an automated kitchen appliance designed lớn boil or steam rice. It consists of a heat source, a cooking bowl, and a thermostat. The thermostat measures the temperature of the cooking bowl and controls the heat. Complex, high-tech rice cookers may have more sensors and other components, and may be multipurpose.
The term rice cooker formerly applied lớn non-automated dedicated rice-cooking utensils, which have an ancient history (a ceramic rice steamer dated lớn 1250 BC is on display in the British Museum). It now applies mostly lớn automated cookers. Electric rice cookers were developed in nhật bản, where they are known as suihanki (Japanese: 炊飯器, literally, "boil-rice-device").
The NJ-N1, developed by Tập đoàn Mitsubishi Electric in 1923, was the first electric rice cooker, a direct ancestor of today's automatic electric rice cookers. At that time, electricity was not widely used in ordinary households; it was for use on ships. It was a simple mechanism that heated with an attached heating coil without automation.
In the 1940s and early 1950s, Tập đoàn Mitsubishi Electric, Matsushita Electric (now Panasonic), and Sony introduced electric rice cookers for trang chính use with built-in heating coils, but they too were not automated and were not well received and sold poorly.
The ER-4, introduced by Toshiba on December 10, 1955 (or 1956), was the world's first automatic electric rice cooker for trang chính use. It was developed by Toshiba's Shogo Yamada beginning in 1951 and completed in 1955 thanks lớn a breakthrough invention by Yoshitada Minami (ja), president of a Toshiba partner company. Research and development was a continuous process of trial and error. Research showed that rice cooks best when cooked at a temperature of 98 degrees Celsius (208.4 degrees Fahrenheit) for đôi mươi minutes, sánh theoretically rice should cook well if an automatic timer is phối lớn turn off the cooker đôi mươi minutes after the water in the pot has boiled. However, the time it takes for the water lớn boil varies depending on the temperature, the amount of heat generated by the pot, and the amount of rice and water, sánh in the prototype stage, sometimes the rice was overcooked and burnt, while at other times it was undercooked and the rice was left with a core. The revolutionary idea lớn solve this problem was lớn use a double-layered structure for the pot. The mechanism involved filling the outer pot with a glass of water and heating it. After about đôi mươi minutes, the water would evaporate and the temperature would rise rapidly, which the thermostat would detect and turn off.
The initial launch price was 3,200 yen, about one-third of the average college graduate's starting salary. At its launch, 700 units were produced, but they did not sell well. The company then conducted sales promotions using the sales networks of electric power companies, held sales demonstrations, and sold an automatic timer that could turn on the rice cooker at any time, and the product's popularity exploded. By 1960, four years after its introduction, the automatic electric rice cooker was in use in about half of all Japanese households.
The success of Toshiba's automatic electric rice cookers sparked a "manufacturing war", and Matsushita Electric entered the field as early as 1956 with the EC-36. The EC-36 was a cheaper product that used a single pot, reducing the amount of metal used and making it more competitive in terms of sales.
Later, the automatic electric rice cooker was well received in Asian countries and among Japanese Americans around the world under the name "Automatic Rice Cooker". It also had a great impact on society, giving housewives more time and accelerating the women's liberation movement. On the other hand, Helen Macnaughtan argued that the invention of the automatic electric rice cooker, which freed women from menial tasks in the kitchen and allowed some women lớn work part-time, was not a great victory for women's liberation because it gave them more time lớn devote lớn other household tasks.
In 1972, a rice cooker with a heat-retention function was introduced, and in 1979, an electronic rice cooker equipped with a microcomputer that could also manage the soaking of rice after washing and the heat level. In 1988, rice cookers with electromagnetic induction heating were introduced, which provided higher heating.
Principle of operation
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A basic rice cooker has a main body toàn thân (pot), an inner cooking container which holds the rice, an electric heating element, and a thermostat.
The bowl is filled with rice and water and heated at full power; the water reaches and stays at boiling point (100 °C, 212 °F). When the water has all been absorbed, the temperature can rise above boiling point, which trips the thermostat. Some cookers switch lớn low-power "warming" mode, keeping the rice at a safe temperature of approximately 65 °C (150 °F); simpler models switch off; the rice has entered the resting phase.
More advanced cookers may use fuzzy logic for more detailed temperature control, induction rather phàn nàn resistive heating, a steaming tray for other foods, and even the ability lớn rinse the rice.
Rice types and rice cookers
Brown rice generally needs longer cooking times phàn nàn white rice, unless it is broken, or flourblasted (which perforates the bran).
Many models feature an ability lớn cook sticky rice or porridge as an added value. Most can be used as steamers. Some can be used as slow cookers. Some other models can bake bread or in some cases have an added function lớn maintain temperatures suitable for fermentation of bread dough or yogurt. Multi-purpose devices with rice cooking capability are not necessarily called "rice cookers", but typically "multi-cookers".
A rice cooker, or slow cooker, can be used in conjunction with a temperature probe and an external thermostat lớn cook food at a stable low temperature ("sous-vide").
Steam rice cookers have been shown lớn be effective for decontamination of face masks.
Wikibooks Cookbook has a recipe/module on
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- Nakano, Yoshiko (2009), Where There Are Asians, There Are Rice Cookers: How 'National' Went Global via Hong Kong, Hong Kong University Press, ISBN 978-988-8028-08-5