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The point of the project is to experience firsthand the copper
temperature coefficient value, the difficulties to use it for such
purpose, and the suitability of more specific devices such as
thermistors.
The idea is to use cheap operational amplifiers, or 2-3
transistors, diodes and resistors, and battery. The indicator can be
any analog or digital tester, or even a few leds. One team should
make this with the original copper coil, another team with carbon
resistors, and another team should make similar but with a
thermistor. After that, they can develop conclusions.