An RC circuit is designed to operate an alarm in a house. The alarm activates when the current through it exceeds 120uA. The alarm is powered by a 9V DC source which is connected to a limiting resistor of 10 k2. One end of the 10 k2 resistor and the other end of the switch is connected to a parallel combination of an 80uF capacitor and a variable resistor R. The variable resistor is connected in series to the alarm, which has a resistance of 4 k2. If the variable resistor has an operating range of 0

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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.