How Does Potentiometer Work?
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POTENTIOMETER
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A potentiometer is a device used for measuring the potential difference between two points in an electric circuit. It is also known as a voltage divider, and its name comes from the words 'potential' and 'meter'. The instrument works on the principle of the potential gradient along a uniform wire or a uniform resistance element.
The basic construction of a potentiometer consists of a long uniform wire of high resistance material such as nickel-chromium, or a resistance element with a slider that can move along its length. The potentiometer has three terminals, one at each end of the wire or resistance element, and one at the slider. The two outer terminals are connected across a constant voltage source, such as a battery or a power supply.
When the slider is moved along the length of the wire, the potential difference between the slider and one end of the wire changes. The potential difference between the slider and the other end of the wire remains constant. Thus, the potentiometer can be used to measure the potential difference between two points in an electric circuit by comparing it with a known potential difference.
The potentiometer has several applications in electrical measurements. It is commonly used to measure the emf and internal resistance of a given cell. In this case, the potentiometer is connected across the cell, and the slider is moved until the potential difference between the two ends of the potentiometer is zero. At this point, the potential difference between the two ends of the cell is equal to the potential difference across the potentiometer.
The potentiometer can also be used to compare the emf of two different cells. In this case, the two cells are connected in series with the potentiometer, and the slider is moved until the potential difference across the potentiometer is zero. At this point, the emf of the two cells is equal.
In conclusion, the potentiometer is a versatile instrument used for measuring potential differences in electric circuits. It is widely used in various applications in electrical measurements and provides accurate and reliable results.
