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A thermistor is often used in thermostats to help electronically regulate the temperature in a room.

The graph above shows how the resistance, measured in kilo-ohms, changes as the temperature changes. A potential difference of $9.0\text{ V}$ is applied to the thermistor when it has a temperature of $+30^\circ \text{C}$.

Which of the following values most closely approximates the current that will flow through the thermistor?


$222\text{ A}$


$2000\text{ A}$


$4.5\text{ mA}$


$0.0045\text{ mA}$

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