A DC compound motor has shunt field resistance of 5002 and series field resistance of 22. Shunt field current is 0.44A. Armature is lap wound with 200 conductors running at 600rpm. Flux per pole is 0.1Wb. Armature winding resistance is 0.12 and it is dissipating 10W. Other losses amount to 35W. Calculate the efficiency of the motor.

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Thermistors

A thermistor is a special type of resistor whose resistance is more temperature-dependent than standard resistors.  The resistance of the thermistor decreases with increasing temperature. This is the basic principle of thermistors. This allows the thermistor circuit to detect very small temperature changes that cannot be observed with the Resistance temperature detectors (RTDs) or the thermocouples. Since the resistance of a thermistor is temperature dependent, it can be connected to an electrical circuit to measure body temperature. This high sensitivity to temperature changes makes thermistors very useful for accurately controlling and calibrating temperature measurements. In general, resistance increases with increasing temperature in most metals, but thermistors react negatively.