oa Vab 9어 Two measurements are made on an unknown two-terminal device: 1. When a 30mV voltage source is connected between nodes a and b with the positive terminal at node a, the current is measured to be 2mA with current flowing down (from a to b). 2. When a 72 resistor is connected between nodes a and b, the voltage is measured to be 21mV with the higher voltage at node a. What are the Thevenin equivalent voltage and resistance of the two-terminal device? Vth = Rth =

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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.