The resistor, Rs,
is a resistive temperature sensor (thermistor) that varies with temperature.
When the temperature is seventy degrees Fahrenheit the resistor has a value
of 1000 W
(1kW).
Determine the value of
Rb
so that the bridge is balanced at a temperature of seventy degrees.
When the temperature rises
to seventy-one degrees, the resistance of Rt drops to 990 ohms.
Determine the output voltage
of the bridge at that temperature, and determine the sensitivity of the
bridge to temperature change (that is change in output voltage for a one
degree temperature change).
