Example 1: A 500 V, 3-phase, 50 Hz, 8 pole star connected induction motor has the following equivalent parameters; R,=0.132, R,=0.32 N, x,=0.6 2, x,=1.48 Q, magnetizing branch admittance Y_ =0.004-j0.05 2' referred to primary m side. The full load slip is 5%. Determine the full-load electromagnetic torque, stator input current and power factor using exact equivalent circuits. The effective stator/rotor turns ratio per phase is 1/1.57. neglect mechanical loss

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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.