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AP® Physics 1 & 2

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Temp and Resistance Graph

APPH12-GCWKY5

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 volts is applied to the thermistor when it has a temperature of +30 degrees Celsius.

What is the approximate current that will flow through the thermistor?

A

222 amps

B

2000 amps

C

4.5 milliamps

D

0.0045 milliamps