QUESTION 3: Given that the network of the figure is to operate at a frequency of f=1 kHz. Calculate the impedance Zx if the total circuit impedance is ZT = 502 260°. (Hint: By ac series circuit, the total impedance Z is the sum of the impedances of components in series: Zr = Z + R + ZL , where Zi = j 2nƒ L). Z7 = 50 N260° RS 10 0 20 mH

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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.