QUESTION 3: The parameters of the two inverting op-amp circuits connected in cascade in Figure P9.16 are R1 = 11 kN, R2 = 78 kN, R3 = 18 k2, and R4 = 81 k2. For input voltage vị= -0.13 V, calculate vo1, vo, iz, and i4. Voi (V)| vo (V) i2 (µA) Format : 0.63779726829547 Format : -6.9832445578297 Format : -98.827586356923 i4 (µA) Format : 85.624732255563 R2 R4 R i2 R3 i4 ovo 10a Figure P9.16

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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.