• The AC coupling on a data acquisition device is modelled as a passive RC circuit. If the resistor is set to 100 kN, which one of the following capacitor options should be used in order to remove the mean voltage from the signal? A) Capacitor placed before resistor with C = 50 µF B) Capacitor placed before resistor with C = 100 pF C) Capacitor placed after resistor with C = 100 µF %3D D) Capacitor placed after resistor with C = 50 pF %3D E) Capacitor in parallel with resistor with C = 1 mF

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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.