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In the 1970s, glass-ceramic cooktops started to appear. Glass-ceramic has very low thermal conductivity and a near-zero coefficient of thermal expansion, but lets infrared radiation pass very well. Electrical heating coils or halogen lamps are used as heating elements.
NEMA 1-15P (two-pole, no ground) and NEMA 5-15P (two-pole with ground pin) plugs are used on common domestic electrical equipment, and NEMA 5-15R is the standard 15-ampere electric receptacle (outlet) found in the United States, and under relevant national standards, in Canada (CSA C22.2 No. 42 [1]), Mexico (NMX-J-163-ANCE) and Japan (JIS C 8303).
Tappan is a brand of appliances, named after company founder W. J. Tappan. [1] [2] Tappan claimed several innovations: 1930s all-porcelain range available in various colors [2] 1955 the first compact (24") microwave oven [2] 1960s electric ignition for gas ranges [citation needed] 1965 single-unit conventional range and microwave oven [2]
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.
AC circuits adopted the same form during the war of the currents, allowing lamps to be run at around 110 V and major appliances to be connected to 220 V. Nominal voltages gradually crept upward to 112 V and 115 V, or even 117 V. [citation needed] After World War II the standard voltage in the U.S. became 117 V, but many areas lagged behind even ...
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