The diagram shows a simple electric circuit consisting of a power source, a resistor, and an inductor. E A model of the current I, in amperes (A), at time t is given by the first-order differential equation, where E(t) is the voltage (V) produced by the power source, R is the resistance, in ohms (N), and L is the inductance, in henrys (H). + RI = E(t) dt Suppose the electric circuit consists of a 32-V power source, a 16-2 resistor, and a 4-H inductor. (a) Sketch a slope field for the differential equation. -2 +1 (b) What is the limiting value of the current?

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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.