Wheatstone Bridge Problem Examples

The wheatstone bridge is an electrical bridge circuit used to measure resistance. The wheatstone bridge circuit an example of a circuit that cannot be reduced using simple series and parallel rules appears the wheatstone bridge circuit above is usually operated by adjusting the variable resistor r3until no current flows in the ammeter.

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Determine the output voltage of temperature measuring bridge circuit.

Wheatstone bridge problem examples. Suppose the resistance of the temperature sensor rm in w is related to the temperature t in 0c by the equation rm 1500 25 t the temperature is expected to vary over the range 0 to 100 0c. If we connected a voltmeter ammeter or classically a galvanometer between points c and d and then varied resistor. This reading can be positive or negative depends on the magnitudes of the voltages at the meter terminals.

If the thermistor is exposed to a temperature of 500c and its resistance at 250c is 10 kw. It consists of four resistors of which two resistors are known resistors one variable resistor and one unknown resistor. Under this special circumstance the above circuit problem may be.

Example of wheatstone bridge from above the wheatstone bridge is unbalanced when the voltmeter reading is not zero. It is commonly known that the strain gage transforms strain applied into a proportional change of resistance. So we can see that a wheatstone bridge circuit can be used to compare an unknown resistance rx with others of a known value for example r1 and r2 have fixed values and r3 could be variable.

It consists of two series parallel arrangements of resistors. Consider the diagram of wheatstone bridge given below. Example consider using a wheatstone bridge having r1 200 w and r2 2000 w to measure a resistance rm of a temperature sensor.

It consists of a common source of electrical current such as a battery and a galvanometer or a multimeter that connects two parallel branches containing four resistors three of which are known. It consists of four arms pq qr. It also consists of a galvanometer.

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. Assume the resistance of the thermistor decreases to 900 w at 500 c.

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