A 300 N resistor R and a 200 µF capacitor are connected in series across an ac power supply which has a voliage Vin and oscillates at an angular frequency w. R a) Determine that the ratio of the output voltage, Voutput, across the capacitor to the input voltage Vinput from the source as a function of the angular frequency o. b) What value does this ratio approach as the frequency tends to zero? i) ii) as the frequency tends to infinity? Voutput c) Plot a graph of the as a function of the angular frequency w. Vinput d) At what frequency, f, is the ratio equal to 0.5 when R = 300 N and C = 200 µF? Solution

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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.