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Alex Willcocks Sensing Coursework I have been assigned the task to test and evaluate a sensor. The sensor I have chosen is a temperature sensor. The sensor is a potential divider circuit. It consists of a power supply of e.m.f 2V, a variable resistor and a 15K? (ptc) thermistor. I will vary the resistance of the variable resistor to see if this will affect the sensitivity of my sensor. To test my sensor I will measure the potential difference across the thermistor at varying temperatures. I will do this using a multimeter, connecting it in parallel across the thermistor. As it is a positive temperature coefficient (p.t.c.) thermistor I will expect the potential difference to increase as the temperature decreases. Experiment 1 Potential difference across thermistor (V) Temperature of thermistor (ºC) 1st attempt 2nd attempt 3rd attempt Mean, µ Standard deviation, ? 0 1.96 1.97 1.96 1.96 0.01 5 1.93 1.94 1.95 1.94 0.01 10 1.93 1.93 1.94 1.93 0.01 15 1.93 1.92 1.90 1.92 0.02 20 1.90 1.91 1.91 1.91 0.01 25 1.89 1.87 1.88 1.88 0.01 30 1.85 1.86 1.86 1.86 0.01 35 1.80 1.83 1.83 1.82 0.02 40 1.78 1.79 1.80 1.79 0.01 These results were...

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