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Fire Alarm Investigation Aim: In this investigation I will be making a fire alarm for an old person's home. I will make a model then test it to see if it is suitable for an elderly home. This investigation is mainly on finding a resistor which will turn on only in the case of a fire by a switch which will detect the fire early thus causing an evacuation of the home. Plan In my investigation I plan to use an electromagnetic bell which will ring only when the switch is activated by fire. My switch will be a negative thermal coefficient thermistor which has high resistance when the temperature is cold but low resistance when the temperature is hot, which will cause it to activate the electromagnet as this will complete the circuit. When the magnet is turned on it will pull on a disc of metal towards it connected to...

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