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A microwave oven or simply microwave is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. [1] This induces polar molecules in the food to rotate and produce thermal energy (heat) in a process known as dielectric heating.
A microwave oven passes microwave radiation at a frequency near 2.45 GHz (12 cm) through food, causing dielectric heating primarily by absorption of the energy in water. Microwave ovens became common kitchen appliances in Western countries in the late 1970s, following the development of less expensive cavity magnetrons. Water in the liquid ...
The most clear difference in efficiency between induction and electric plate is when the pan was smaller than the hob size. For induction, the efficiency of heating water is roughly 76%, whether it is tested with a small or larger pan. For electric coil cooktops, efficiency drops from over 80% for large pans to 40–50% for smaller pans. For ...
Hotpoint continued as a subsidiary of GEC until 1989, when it was merged into a new division of GEC called General Domestic Appliances (GDA). 50% of GDA was purchased by General Electric (USA), with whom it owned the joint venture. In 1998, the Redring and Xpelair brands also joined GDA, and Hotpoint was categorized as part of GDA Applied Energy.
A pressure oven is a recent combination of an oven and pressure cooker, usually as a countertop convection oven. Pressure ovens operate at low pressures, 10 kilopascals (1.5 psi), compared to other pressure cookers. [32] Their main function is as an enhanced oven or broiler for meat and poultry, avoiding drying. As such, they often include a ...
Amana produced the first practical commercial microwave oven in 1967. [56] The division was sold to Goodman Global in 1997 and then sold to Maytag in 2001. It became part of the Whirlpool Corporation when it purchased Maytag in 2006. [55]
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