Sunday, 27 January 2013

Rheostats Lecture Notes


Rheostats Lecture Notes: Rheostats are high power variable resistors. Rheostats have sliding contacts, the resistance value is varied by the sliding contacts. By winding suitable wire over a ceramic former coated with enamel, rheostats are manufactured. The sliding contact moves along a line with linear variation in resistance. The end portions of the movable contacts and the resistance wire are connected to a three lug type terminal.
The power ratings of rheostats are ranging from 10 to 100 Watts. The maximum withstanding temperature of rheostats are up to 3000C. The resistance value of rheostats varies from 10Ω to 5KΩ.

Figure 1
Figure 1 shows the circuit diagram of a rheostat. A rheostat can be used in an electronic circuit for the variation of currents through the circuit. In figure 1, as the value of the rheostat changes, the current through the lamp also changes.

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