Problem 1 This problem is a problem to help you recall some of your circuit's basics. The switch drawn in this circuit has been closed for a long time that any transients which might have arisen from first Connecting the voltage source have disappeared. (a) Determine the circuit time constant. (b) Calculate the voltage v(t) at t =5t where t = RC is the time constant. 100 N t = 0 200 N 2 nF 4 V 150 N

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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.