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An electric plate cooktop. A cooktop (American English), stovetop (Canadian and American English) or hob (British English), is a device commonly used for cooking that is commonly found in kitchens and used to apply heat to the base of pans or pots. Cooktops are often found integrated with an oven into a kitchen stove but may also be standalone ...
Indonesian traditional brick stove, used in some rural areas An 18th-century Japanese merchant's kitchen with copper Kamado (Hezzui), Fukagawa Edo Museum. Early clay stoves that enclosed the fire completely were known from the Chinese Qin dynasty (221 BC – 206/207 BC), and a similar design known as kamado (かまど) appeared in the Kofun period (3rd–6th century) in Japan.
A glass-ceramic cooktop (2005) Early electric stoves had resistive heating coils which heated iron hotplates, on top of which the pots were placed. [ 13 ] Eventually, composite heating elements were introduced, with the resistive wires encased in hollow metal tubes packed with magnesite . [ 14 ]
Today, there are two major types of electrical stoves with cooktops made of glass-ceramic: A radiant heating stove uses coils or infrared halogen lamps as the heating elements. The surface of the glass-ceramic cooktop above the burner heats up, but the adjacent surface remains cool because of the low heat conduction coefficient of the material.
In 1953 S. Donald Stookey of the Corning Research and Development Division accidentally discovered Pyroceram, a white glass-ceramic material capable of withstanding a thermal shock of up to 450 K (840 °F). He was working with photosensitive glass and placed a piece in a furnace, planning on heating it to 600 degrees Fahrenheit.
The DOE test cycle starts with both the block and the cooktop at 77 °F ± 9 °F (25 °C ± 5 °C). The cooktop is then switched to maximum heating power. When the test block temperature reaches 144 °F (80 °C) above the initial room temperature, the cooktop power is immediately reduced to 25% ± 5% of its maximum power.
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