The resistance of an NTC thermistor decreases with increasing temperature. A voltage-current graph for a thermistor is shown below. Voltage - Current graph for a thermistor as current and ...

Why? For current to flow, it must overcome the body’s resistance, which requires sufficient voltage. A car battery’s 12 volts simply aren’t strong enough to push enough current through the body.

You might think the probes in the picture are just funny looking ... you aren’t really ever measuring a resistance. You are measuring a voltage and a current. With a four-wire measurement ...

Record voltage, current and diameter of the wire, d (supplied by the manufacture). Calculate resistance and cross section area, A, in mm 2 (A = \(\frac {{\pi }d^2}{4}\)). Plot a graph of ...