Wheatstone bridge

In Physics, the Electricity and Circuit chapter carries important marks weightage. Whether it is the board examination or competitive exams, this module emerges as the score decider. In this, there are several modules included like Resistance, flow of charge and current phenomena. Among them, in the resistance part there is a terminology called Wheatstone bridge.It is a quadrilateral arrangement of four resistance which is connected to a galvanometer. The net flow of current is balanced and the reading becomes zero. Thereby, we can say it as a balanced arrangement. Now, coming to the vital part, let’s discuss why they are so important to study. Read on to know its real-life applications

Wheatstone bridge: Applications in daily life

Balanced bridge circuits

Today, several electronic devices have applied the Wheatstone bridge application. Engineers integrate few technical elements and allow devices to measure the changing intensity of strain, light and pressure. Remember that it helps in finding the value of unknown resistance.

Also, it delivers precise results. The net null value helps in finding the value of the particular resistance. Potential resistors used in this bridge formations are Light Dependent Resistor LDR, potentiometers, thermistors and others.

Light detector

Students studying Current and Electricity must have come across the terminology light detector. It is a device that converts low light level into electrical signals of the suitable amplitude. So, has anyone thought what phenomena this device used to detect light?  Yes, you guessed it right! It is the Wheatstone bridge.

By applying its principle, it measures the light with a photo resistive device. Likewise, in Wheatstone bridge, the photo resistive device is replaced by the light dependent resistor. But, remember that both of them have the same function of converting visible light into a resistance change. Thus, we can say that light detectors also have the real-life application of Wheatstone bridge.

Strain gauges for resistance Measurement

Strain gauges measure the proportional resistance with variance in the device. Practically, applying other principles and methodology besides Wheatstone bridge will not give the desired outcome. Basically, it is a sensor whose current resistance varies according to flow charge or current. Besides, its resistance capacitance ranges from 30 ohms to 300 ohms.

Undoubtedly, the resistance will sustain for less time, but it requires an accurate calculation. Thus, no other principle is better than Wheatstone bridge to calculate the same. Several educators and academicians suggest that covering this principle will give the basic idea of resistance. Also, it will fetch good scores in the examination.

Drawbacks of the Wheatstone Bridge

Like every coin has its two sides, the Wheatstone bridge also has few of the drawbacks associated with it.

First, it does not deliver the precise results while calculating the large resistance power. Here, students will get the non-linear results. The respective bridge principle is used to measure slight changes or sensitive resistance.

Generally, it is applied to calculate resistance of a few ohms or kiloohms. Not all kinds of resistance are easy to calculate using this principle.

The circuit sensitivity of the Wheatstone bridge is reduced if the resistance power of four resistors are not comparable.

The bottom line

So, this was all about the Wheatstone bridge concept. Especially, class 11th and Class 12th students will have a better idea about this concept. Also, calculating the resistance power is easy using this application. Students who think that it has no real life application must read this post carefully. Above we have mentioned all details carefully citing a few limitations too. Hence, if you found this post informative, share it with your learning peers.


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