Advantages of Potentiometer 3. Now again we adjust the sliding contact on the transistor to make the galvanometer current zero and once it becomes zero that is zero deflection is indicated in the galvanometer, we take the position of the sliding contact tip on the resistor scale and say it is L2. Then the length (x) is called the length of the null point. The switch which is ON determines the potentiometer resistance and the number of switches determines the resolution of the device. The other end of the galvanometer is connected to a sliding contact on the resistor. Related posts: A potentiometer consists of a resistive element having a sliding contact. The negative terminal of both cells is joined with the galvanometer in turn through a two-way switch. It is used in injection mold machines. There are still several kinds of potentiometers and their selection mainly depends on certain necessities like the following. These potentiometers are used in huge quantities in the manufacture of electronics equipment that provides a way of adjusting electronic circuits so that the correct outputs are obtained. This can be used for the measurement of translational as well as rotational displacement. - Structure & Tuning Methods. Sometimes, these are also called RDACs (resistive digital-to-analog converters). E. Out of phase by 180 0 However, a digital potentiometer is used to change its resistance automatically based on the given state. In potentiometer, the voltage is controlled by adjusting the sliding contact on the resistance. Where r is the internal resistance of the battery cell. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. The other end of the galvanometer is in contact with the resistor via a sliding contact as shown in the figure above. In rheostat, only one terminal of the uniform resistance is connected to the circuit and the other end of the resistance is kept open. I would like the current to go from 0-12v DC, but I dont know whay resistance to get? Materials used for Potentiometers 2. Here, if the electric potential of both battery cells is exactly the same, there is no circulating current in the circuit and hence the galvanometer shows null deflection. Connect the two ends of the resistive wire L to the battery terminals as shown below; let us assume this is a primary circuit arrangement. The current flowing through the resistance is controlled by a rheostat connected in series with the driver cell. So the driver cell voltage must be better as compared with the measured voltage. 8-bits are equal to 256 steps. The applications of potentiometer include the following. AC Potentiometer Definition: The potentiometer which is used for measuring the phase and the magnitude of the unknown emf by comparing it with the known emf such type of potentiometer is known as the AC potentiometer. So, now we have to move the sliding contact over the resistor till the galvanometer displays zero deflection. 99 These potentiometers are called POT due to its POT shaped structure. The potentiometer is also named as the POT in short. the sliding … Such a device is also known as a slide potentiometer. Potentiometer types. These potentiometers are mainly used to get a changeable voltage supply to a fraction of circuits. This is how a potentiometer measures the voltage between two points (here between A and B) without taking any current component from the circuit. The potentiometer sensitivity can be defined as the least potential variation that is calculated with the help of a potentiometer. 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