Thermistor is a temperature dependent resistor. The thermistor resistance R7 is related to e temperature by the equation Rf = Ro * e#G) where T has units of °K and R is in Ohms. Ro is resistance at temperature To and the parameter B is in °K. For example, that a particular thermistor has a resistance Ro=620 N suppose at the temperature To=20°C= 293 °K and ß= 3330 °K. At T=70°C=343 °K the resistance of this thermistor will be 3330(: RT 3D 620 * е 343 293'=121.68 . In Figure DP 3-9 this particular thermistor in used in a voltage divider circuit. Specify the value of the resistor R that will cause the voltage Vr across the thermistor to be 4V when the temperature is T= 50 °C

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DC Generator

An electromechanical machine which converts input mechanical energy to respective output electric energy is called a generator.