The variable resistor in the circuit in Fig. P4.82 is adjusted for maximum power transfer to R,. a) Find the value of R b) Find the maximum power that can be delivered to R.- c) Find a resistor in Appendix H closest to the value in part (a). How much power is delivered to this resistor? Figure P4.82 2.4 kn 1.6 k) 60 V 4.8 k )15 mA 1.8 k

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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.