Example 8.11(b). A 4-pole lap-connected armature of a d.c. shunt generator is required to supply the loads connected in parallel: (1) 5 kW Geyser at 250 V, and (2) 2.5 kW Lighting load also at 250 V. The Generator has an armature resistance of0.2 ohm and a field resistance of 250 ohms. The armature has 120 conductors in the slots and runs at 1000 rpm. Allowing 1 Vper brush for contact drops and neglecting friction, find (1) Flux per pole, (2) Armature-current per parallel path. (Nagpur University Nov. 1998)

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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.