potentiometer level measurement
Asked by Ekta Singh Thakur
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2 Answers
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A potentiometer is a device to measure potential difference across a conductor on the basis of null point.
Principle of Potentiometer: It's based on Ohm's law i.e. V=IR V= I rho l/A [ R= rho l/A]V is directly proportional to l, when I, rho & A are costantSo, V= Kl [K is constant of P.meter]
P.meter doesn't draw any current from the cell when zero deflection is observed as such it is more accurate than a voltmeter.It is used to measure internal resistance also , potential difference between two points, emf.
V.meter:Its working is based on deflection method, it always draws some current from the circuit, so it measures less than actual po...more -
A potentiometer is a manually adjustable resistor. The way this device works is relatively simple. One terminal of the potentiometer is connected to a power source. Another is hooked up to ground (a point with no voltage or resistance and which serves as a neutral reference point), while the third terminal runs across a strip of resistive material. This resistive strip generally has a low resistance at one end; its resistance gradually increases to a maximum resistance at the other end. The third terminal serves as the connection between the power source and ground, and is usually interfaced to the user by means of a knob or lever. The...more
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