The Wheatstone bridge circuit above is usually operated by adjusting the variable resistor R3until. no current flows in the ammeter. Under this special circumstance, the above circuit problem may be solved easily without the need for Kirchoff's rules. Example Consider using a Wheatstone bridge having R1 = Ω and R2 = Ω to measure a resistance, Rm, of a temperature aya-ueto-message-rar.come the resistance of the temperature sensor, Rm, in Ω, is related to the temperature T, in °C, by the equation Rm = 25+ T The temperature is expected to vary over the range 0 to °C. The Wheatstone bridge is also well suited for the measurement of small changes of a resistance and is, therefore, also suitable for measuring the resistance change in a strain gage (SG). It is commonly known that the strain gage transforms strain applied into a proportional change of resistance.
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