(i) With the aid of a diagram, explain what is meant by an invertina amplifier. (ii) With no input signal applied to the amplifier, the voltage between the collector and emitter of the transistor is 2.5 V. Calculate: (a) the voltage across the collector resistor (b) the collector current (c) the base current (d) the current gain B of the transistor

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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.