Y Y b X Y Consider the network above in which the elements can be resistors, capacitors, or inductors. a. Assume first that the network consists of resistors, with Ry= 2S, Ry= 42, and R,= 62. What is the equivalent resistance measured between nodes a and b? Answer: b. Now, assume that the network consists of capacitors, with C, = 2µF, C,= 4µF, and = 6µF. What is the equivalent capacitance measured between nodes a and b? Answer: c. Finally, assume that the network consists of inductors, with Ly = 2mH, Ly= 4mH, and L, = 6mH. What is the equivalent inductance measured between nodes a and b? Answer:

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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.