1) Wire wound potentiometers: This potentiometer comprises of several rounds of wire wound around the shaft of the non-conducting material. For handling greater currents induction wattmeters are used in conjunction with, 7. Presently the most common use I think would be as a component of a solid state motor speed control. When a cell of 1×5 V emf is used in the secondary circuit, the balance point is found to be 60 cm. A potentiometer can be used for super precise input, down to the mV level, for motor speed control and for projects where precision is key. It worked by comparing the unknown voltage to a known DC reference voltage in a bridge circuit, using a precision voltage divider. For example, investigate a mechanical change (leverage / gearing) to increase the movement used for measurement; or look at other measurement options (e.g. Fig. Question is ⇒ A potentiometer may be used for, Options are ⇒ (A) measurement of resistance, (B) measurement of current, (C) calibration of ainmeter, (D) calibration of voltmeter, (E) all of the above, Leave your comments or Download question paper. A potentiometer is a device which is used to measure potential difference across a component. The circuit can be readily adapted for comparing resistances, for calibrating ammeters and voltmeters measuring both high and low EMFs and for determining the internal resistance of a cell. Further practical details have been given by Tyler (1972) and Hughes (1977). The ion-selective membrane of the … These potentiometers consist of a germen silver or manganin wire. Multiple Choice Questions(MCQ) on Network Theorem 1. It is possible to compare the emf of two cell with a potentiometer. of a Weston cell is accurately measured by, 45. But there is one major difference between their measurements, DC potentiometer only measures the magnitude of the unknown voltage. A potentiometer is a resistor with a sliding contact, the position of which can be varied. The voltage drop across the known and unknown resistance is measured and by comparison the value of known resistance is determined Trim pots are directly mounted onto circuit boards and can be set horizontally or vertically and can operate on a single or multi-turn basis. Comparing the emf of a battery cell with a standard cell 2. MCQ on Measurement and Instrumentation for Electrical Engineering, 30 Most Asked Objective Questions or MCQ on Magnetism and Electromagnetism for Electrical Engineering, 17 Most Asked Objective Questions or MCQ on Network Theorems for Electrical Engineering, [TOP] Most Asked Objective Questions or MCQ on Transformer for Electrical Engineering. A potentiometer may be used for (a) measurement of resistance (b) measurement of current (c) calibration of ammeter (d) calibration of voltmeter (e) all of the above Ans: e. 21 is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another, (a) Tangent galvanometer (b) Meggar (c) Current transformer (d) None of the above Ans: b. The potentiometer can be used for the measurement of translational as well as well rotational displacement. A trimmer potentiometer, or trim pot, is a small potentiometer that is used for adjusting and calibrating circuits in order to provide an exact output voltage or current. When a potentiometer is used as a rheostat, the “unused” terminal is often connected to the wiper terminal, like this: At first, this seems rather pointless, as it has no impact on resistance control. Since direct measurement of the potentiometer characteristic does not make it possible to assess the extent of such an error, only the difference between the potentiometer characteristic and that of an essentially perfect master potentiometer is plotted as in the practical example given in Fig. Since the reference voltage can be produced from an accurately calibrated voltage divider, a potentiometer can provide high precision in … According to application, instruments are classified as, 2. potentiometer is also called linear position sensors or resistors ruler and it is one of the most commonly used devise for measuring the displacement. The oscillation of the sensitivity to which the output ratio of the unknown voltage for larger values, then follows... Flux-Meter, ( b ) increase the sensitivity to which the output of. The resistances the moving coil voltmeter, 16 static sensitivity, 40 is connected to a known voltage.The source. 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