26. The following information is given in connection with tests performed on a 50-kva 4,600/230-volt 60-cycle transformer: Open-circuit test... . Eoc Short-circuit test.... 230 volts; Poc 285 watts 150 volts; Psc 615 watts; Isc Esc - 10.87 amp Calculate the per cent efficiency when the transformer is delivering rated kva at a power factor of 0.84. 26

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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.