Syllabus  | |  How do bimetallic strips, thermostats and fire alarms work in relation to expansion in the energy section of the syllabus?
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| | | | | | 1.  haidabez (3142) | 3 years ago |  A bi-metal strip is a strip of metallic material made up of two layers (strips) of different metals. The metal layers are bonded together. When the temperature of the bi metal strip is raised, one metal layer expands more than the other and so the BI-metal strip bends. The strip is arranged so that when it bends it causes a circuit to be completed. The completed circuit then activates an alarm. The bending of the strip could be used to break a circuit eg in a thermostat to break a circuit, causing a heater to be switched and thereby controlling the temperature of the air in a room.
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