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A thermostat is an automatic temperature control device widely used in everyday appliances. Option A (To measure temperature) is incorrect — measuring temperature is the function of a thermometer, not a thermostat. A thermostat does sense temperature but its primary function is control, not measurement. Option B (To stabilize and maintain constant temperature) is CORRECT — the image states: थर्मोस्टेट यंत्र के क्या कार्य हैं — तापक्रम का स्थिरीकरण. A thermostat automatically controls heating or cooling equipment to maintain a set temperature. When temperature rises above the set point, the thermostat switches off the heater (or switches on the cooler). When it falls below, the heater is switched on again. It uses a bimetallic strip that bends at a specific temperature to make or break an electrical circuit. Used in: electric irons, geysers, refrigerators, air conditioners, ovens, incubators. Option C (To convert heat into electricity) is incorrect — converting heat to electricity is the function of a thermocouple (Seebeck effect) or thermoelectric generator, not a thermostat. Option D (To transfer heat from cold to hot) is incorrect — transferring heat from a cold body to a hot body (against natural flow) is the function of a refrigerator or heat pump, which requires external work. This is based on the second law of thermodynamics.
FAQ
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Heat is a form of energy that transfers between objects or systems due to a temperature difference, moving from a hotter body to a cooler one until thermal equilibrium is reached.
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