Crop damage due to frost is one of the many risks confronting farmers. The figurebelow
Chapter 3, Problem P3.33(choose chapter or problem)
Crop damage due to frost is one of the many risks confronting farmers. The figurebelow shows a simple alarm circuit designed to warn of frost. The alarm circuit usesa device called a thermistor to sound a buzzer when the temperature drops belowfreezing. Thermistors are semiconductor devices that exhibit a temperature dependentresistance described by the equationR R eT T = 01 10where R is the resistance, in , at the temperature T, in K, and R0 is the resistance,in , at the temperature T0, inK. is a constant that depends on the material used tomake the thermistor. The circuit is designed so that the alarm will sound whenRR RRR R2243 4 +
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