Labelled strip heaters

A bimetallic strip is used to convert a temperature change into mechanical displacement. The strip consists of two strips of different metals which expand at different rates as they are heated. The different expansions force the flat strip to bend one way if heated, and in the opposite direction if cooled below its initial temperature. The metal with the higher coefficient of thermal expansion is on the outer side of the curve when the strip is heated and on the inner side when cooled. The invention of the bimetallic strip is generally credited to John Harrison , an eighteenth-century clockmaker who made it for his third marine chronometer H3 of to compensate for temperature-induced changes in the balance spring. The strip consists of two strips of different metals which expand at different rates as they are heated, usually steel and copper , or in some cases steel and brass.
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Bimetallic strip

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Using a Strip Heater

A fan heater , also called a blow heater , is a heater that works by using a fan to pass air over a heat source e. This heats up the air , which then leaves the heater, warming up the surrounding room. They can heat an enclosed space such as a room faster than a heater without fan, but like any fan, creates audible noise. Electric fan heaters can be less expensive to buy than other heaters due to simple construction.
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Labelled strip heaters

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Plastics such as acrylic can be formed shaped in different ways. An example of a strip heater is shown below. A heating element extends along the length of the strip heater and gives off intense heat when it is turned on. The desk organiser seen opposite has a steel wire frame and plastic shelves.
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