Faris Shajahan said:In a circuit if the potential difference between two points is zero, no current flows between the two points, right? Or am I wrong? I feel like I am wrong.
Faris Shajahan said:If I am right, then in a Wheatstone bridge, no current passes through the bridge. Then instead of removing the bridge, why don't we connect the two points?
Yes.Faris Shajahan said:Btw Am I also correct when I say if there is no current flow through a resistor, then potential difference across the resistor is zero?
You can. It will give you the same result.Faris Shajahan said:Hence why don't we join the two ends of the bridge and consider the whole thing as a series combination of a parallel combination of two resistors?
Ah, yes. Multiple points with the same potential are effectively the same point, makes no difference whether you join them or not.cnh1995 said:Yes.
You can. It will give you the same result.
A Wheatstone bridge is an electrical circuit that is used to measure an unknown resistance by comparing it to a known resistance. It consists of four resistors connected in a diamond shape, with the unknown resistance and a variable resistor forming two sides of the diamond. A power source is connected to the two remaining corners, and a voltmeter is connected between the two sides of the diamond. When the unknown resistance is equal to the known resistance, the bridge is balanced and no current flows through the voltmeter.
No current flows through the Wheatstone bridge when it is balanced because the voltage drop across the two sides of the diamond is equal. This means that there is no potential difference and therefore no current flowing through the voltmeter. The balance of the bridge is achieved by adjusting the variable resistor until the voltmeter reads zero.
The purpose of a Wheatstone bridge is to measure an unknown resistance with high accuracy. It is commonly used in electronic circuits and experiments to determine the resistance of a component or to detect changes in resistance, such as in strain gauges or temperature sensors.
One of the main advantages of using a Wheatstone bridge is its high accuracy in measuring an unknown resistance. It is also a very simple and cost-effective circuit to set up, requiring only a few components. In addition, it is not affected by changes in the power supply, making it a reliable method for measurement.
One limitation of a Wheatstone bridge is that it can only measure resistances within a certain range. If the unknown resistance is too high or too low, the bridge will not be able to balance and the measurement will be inaccurate. In addition, the bridge can be affected by external factors such as temperature changes, which may cause the resistance values to shift and affect the accuracy of the measurement.