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1) A wirewound potentiometer consists of a resistive wire wound on insulating material, with the resistance value depending on the wire diameter, length, and cross-section. 2) Potentiometers are used to control volume, balance, linearity and brightness in TV sets and amplifiers. They are also used in various types of meters. 3) Resistor color codes use colored bands to indicate the resistance value, with the first two bands representing digits and the third band representing a multiplier, while the fourth band indicates the tolerance.
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Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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Training: ISO/IEC 27001 Information Security Management System - EN | PECB
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Bsc i
- 1. B.SC I SEM I ELECTRONICS Prof. D. B. Bobade
- 2. WIREWOUND POTENTIOMETER • As shown, it consists of a resistive wire wound on insulating material. • In this, the value of resistance of a resistor depends on diameter, length and cross section of a wire and type of wire used. • The whole assembly is enclosed in a metal case.
- 3. USES OF POTENTIOMETER 1. In amplifier for volume control. 2. In TV sets for controlling volume, balance, linearity and brightness. 3. In various types of meters.
- 4. RESISTOR COLOR CODE • It is used for finding out the value of resistance of a resistor. • On the outer surface of resistor, a ring of different colors are marked as shown. • COLOR CODE CHARACTER: • Black – 0, Brown – 1, Red – 2, Orange – 3, Yellow – 4, Green – 5, Blue – 6, Violet – 7, Gray – 8, White – 9, Gold – 10-1 , Silver – 10-2
- 5. • Now, to find out value of resistance, the rings are read from left end. • The value of first two rings are written one after the other and put number of zeros corresponding to the value of third ring. • The fourth ring gives the tolerance. E.g. Gold ± 5 %, Silver ± 10 %, No color or white ± 20 %. • E.g. The first ring is yellow – 4, second ring is violet – 7, third ring is orange – 3, fourth ring is silver - ±10 %, then the value of resistance of above color code band resistor is = 47000 Ω = 47 K Ω ± 10 %.
- 6. POWER RATING OF RESISTOR • It indicates the maximum wattage it can dissipate without excessive heat. • It gives the indication of maximum current a resistor can safely carry. • The physical size of resistor indicates its wattage. • Greater the physical size, higher will be the power rating. • TOLERANCE: • The amount by which the actual resistance can be different from the color code value. • It is given in %. • E.g. 1000 Ω resistor with ± 10 % tolerance can have resistance value between 1100 Ω to 900 Ω. • Smaller the tolerance, more accurate the resistance value and higher the cost.