7. For a bidirectional ac voltage controlled heater with supply voltage of 230 volts, load is of 100 Q and the firing angle is T/4. i. Find the rms output voltage and power absorbed in the load. ii. Now if the load is replaced by a 2 kW heater, find the new power dissipated in the load

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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.