A student connects a thermistor to a battery and an ammeter. He places the thermistor in a beaker of water and gradually heats the water from 10 °C to its boiling point, recording the value of the current as he does so. He then plots a graph of the current in the thermistor against the temperature of the water.
a. Sketch the graph you would expect the student to obtain from the experiment.
b. Explain how the student could now use the thermistor as a thermometer.