A given material has a resistance of 20Ω at room temperature (20 degrees celcuius) and 25Ω at a temperature of 85 degrees celcius.
a. Does the material have a positive or negative temperature coefficient? Why?
b. Determine the value of the temperature coefficient at 20 degrees celcius.
c. Assuming the resistance versus temperature function to be linear, determine the expected resistance of the material at 0 degrees celcius( the freezing point of water) and at 100 degrees celcius (the boiling point of water)