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Exploring the characteristics of a sensor AIM: The aim of my experiment is to measure the resistance of a thermistor at temperatures which are acceptable by the human body. I can then use this information to create a sensor that can be placed in a bath to record the temperature. This will be beneficial to people who cannot feel the temperature of bath water such as a person who has suffered from a stroke. RESEARCH To be able to do my experiment successfully I needed to find out a suitable temperature range to test on. I found out that the human body tolerates temperatures from 25°C to 45°C. I also decided to research thermistors. There are two kinds of thermistors; these depend on the sign of the resistance. If the resistance is positive, the resistance increases with the temperature and is called positive temperature coefficient (PTC) thermistor. If the sign is negative, the...

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