Q.15: The switch has been in position "a" for a long time. At t=0 the switch is moved to position "b". Use classical method to find the voltage across and current through the capacitor as a function of time? (Ans.: vc(t)=80[1.25-e 5000t t%3D0S 30V 42 100V 2uF (cos5000t+sin5000t)] V & ic(t)=1.6e S000t sin5000t A)

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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.