With a voltage source of v. = 500 cos(wt + 30°) V, the current ig is found to be ig = 100 sin(@t + 173°) mA. %3D a) Find the frequency w. b) Find a different operating frequency w at which the voltage v, and the current i, will be in phase. c) Find the voltages across the inductor and the capacitor under the operating frequency found in (b). Exam and reflect on the amplitudes and phase of the two voltages. 3 kN ig 31.25 µF Vg 1 H

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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.