21.3 For the series circuit in Fig. 21.52: a) Find the value of X. for resonance. R 100 n b) Determine the magnitude of the current I at resonance. Xc2 k 12 V c) Find the voltages Ya, Yı, and yc at resonance, and compare their magnitudes. d) Determine the quality factor of the circuit. Is it a high- or low-Q circuit? e) If the resonant frequency is 5 kHz, determine the value of L and C. ) Find the bandwidth of the response if the resonant frequency is 5 kHz. 9) What are the low and high cutoff frequencies?

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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.