b. The expression for the load current (i,) can be written as a function of the input voltage (v) and the load voltage (v,) iz = Avin + Bv, 1. What should be the condition for R,, R,, R3, and R4, so that B is zero? (NB: this condition will make i, depend only on vn and not on R.) R4 R3 OA1 Vo + R2 R1 + Vin RL VL

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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.