86. A 5-kva, 2,300/460-volt distribution transformer is to be connected as an auto- transformer to step up the voltage from 2,300 to 2,760 volts. (a) Make a wiring diagram showing how this should be done. (b) When used to transform 5 kva, calculate the kilovolt-ampere load output.

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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.