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
Can you please reply to my email? my quiz about to start here. I tried calling you guys, but no one answered the phone. If I don''t get a reply in 15 min, I''ll have to ask for a r

A step-up transformer has a primary coil having of 152 turns and a secondary coil with 3040 turns. The primary coil receives a peak voltage of 98 V. a. What is the effectiv

What is potential and kinetic energy?

Explain Constant current system Constant current system : - In this process, the charging current is kept constant by varying the supply voltage to overcome the enhanced back

Construction: A motor require essentially a rectangular coil called armature a permanent magnet, a device called commutator to reverse the direction of current and a source of ele

APPLICATION TO BALLISTIC MISSILES:  "An unpowered and unguided missile is known as ballistic missile". The path followed by ballistic missile is known as "ballistic trajectory"

Q. Show Constant Moment Arm? The simplest case is that of a point mass, and the moment of inertia can be immediately written as                                   I = mR 2 ,

WHERE DOES C.O.G AND C.O.M DIFFER?....GENERALLY BOTH COINCIDES....GIVE EXAMPLE WHERE BOTH DIFFER? Ans) C.O.G and C.O.M mainly coincides at the see-level region.But C.O.G is a va

Waves: A disturbance that travels by a medium is called wave.