Consider the op-amp circuit below. (a) Find the expression of vout in terms of vin. (b) Sketch the waveform of vout if vin = 2sin (wt) 20ka 10V Vin 10kO -10V 10V 20ka 1.5k0 10V 10V 10ka 10kO 10kO Vout 10ka -10V 2. SkO 10V 10V 1ka -10V -10V

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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.