A transformer shown in Figure 10 is needed that will cause an actual load resistance of 250 to appear as 100N to an AC voltage source of 240Vrms. a) Determine the transformation ratio required for the transformer b) Find the current taken from the source c) Find the current flowing through the load d) Determine the voltage across the load e) Calculate the rms power dissipated by the load 12 240V rms "Load VLoad ZLoad 25 Q VLoad sine 1002 N1: N2 Figure 10.

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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.