NTC Thermistor Applications
Popular because of their ability to measure
temperature accurately and inexpensively, however
are non-linear and not able to handle much power
In-rush current limiter
Thermal time constant is longer than
the circuit’s RC time constant
Temperature Measurement
Good for low cost temperature measurement
Temperature Control
Temperature Compensation
Compensates for components with
 positive temperature coefficients
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For temperature control, the detector voltage is replaced with a relay.  The bridge has to be balanced so that, at steady state conditions, the current through the coils is negligible

Most conductors have positive TCRs