(a) A voltmeter with Permanent Magnet Moving Coil (PMMC) instrument of full-scale deflection of 300 uA, and a col resistance of 1.4 ko is shown in Figure Q2 (a). The voltmeter range is 0-20| v. O Evaluate the value of the multiplier resistance Re. (6) Calculate the value of shunt resistance needed to convert the voltmeter to an ammeter capable of measuring a current of 20A. PMMC Ca tance

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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.