Resistors and resistors characteristics, Physics

A resistor is a two-terminal electrical or electronic component that resists an electric current by producing a voltage drop between its terminals in the accordance with ohm’s law.

                                                   R = V/I

The electrical resistance is equivalent to the voltage drop across the resistor divided by the current specifically flowing through the resistor. Resistors are integral part of all electronic circuits. There are basically two types of resistors (1) General purpose (2) high stability. General purpose resistors are of carbon composition. They are inexpensive. They are not so stable and their tolerance is 5 to 20% in value. High stability resistors include metal-film, cermets, metal foil, and wire would resistors. Their tolerances are low and range from 0.1 to 5%. While selecting a resistor, the following points are to be considered:

(1)         Value, size and shape, leads

(2)         Stability

(3)         Tolerance

(4)         Temperature coefficient of resistance

(5)         Power rating

(6)         Maximum operating voltage

(7)         Reliability

(8)         Change in resistance value with frequency

(9)         Load life, environmental condition and age.

The SI unit of electrical resistance is the ohm (O). In an ideal resistor, the resistance remains steady regardless of the applied voltage or current flowing with the device or the rate of change of the current. While real restrictors cannot attain this goal; they are designed to present little variation in electrical resistance when subjected to these changes, or to changing temperature and other environmental factors.

CHARACTERISTICS OF RESISTORS: The following characteristics are inherent in all resistors and can be controlled by design considerations and choice of material.

Posted Date: 7/9/2012 4:04:34 AM | Location : United States







Related Discussions:- Resistors and resistors characteristics, Assignment Help, Ask Question on Resistors and resistors characteristics, Get Answer, Expert's Help, Resistors and resistors characteristics Discussions

Write discussion on Resistors and resistors characteristics
Your posts are moderated
Related Questions
Moderation: In a nuclear reactor, the fast moving neutron has to be slowed down by the use of Boron rods before they are able to cause further fission. The process of slowing d

Hello, I''d like to ask, why do objects, that fall from higher heights hit stronger that those, falling from smaller heights, if force equals mass times acceleration, and yet accel

A polyatomic (non-linear) molecule (like NH3) can rotate about any of three co-ordinate dimension. As it has 6 degrees of freedom, 3 rotational and 3 translational. At normal tempe

Einstein-Podolsky-Rosen effect; EPR effect: Assume the following quantum mechanical thought-experiment: Take a particle that is at rest and contain spin zero. It decays sponta

Charging an Electroscope by Induction Using a Negatively Charged Balloon One general expression performed along with the electroscope includes the induction procedures of charg

What do you understand by half period zones? What is their other name? Distinguish between physical and geometric (wave) approximations of light.

Describe how tunneling takes place in reversed bias When junction is reversed biased, p-region moves up with respect to the n-region as a result, filled energy levels on p- sid

Stopping Distance of a Hot Wheels Car While the Hot Wheels car collides along with the box and skids to a stop, external forces do an important amount of work upon the car. The

Lambert's laws (J.H. Lambert): Lambert's first law The illuminance on a surface illuminated through light falling onto it perpendicularly from a point source is propor

What is hall Effect? Derive an expression for it.