Define resistance in lumped-circuit, Electrical Engineering

Assignment Help:

Q. Define Resistance in lumped-circuit?

An ideal resistor is a circuit element with the property that the current through it is linearly proportional to the potential difference across its terminals,

i = v/R = Gv, or v = iR

which is known as Ohm's law, published in 1827. R is known as the resistance of the resistor with the SI unit of ohms (), and G is the reciprocal of resistance called conductance, with the SI unit of siemens (S). The circuit symbols of fixed and variable resistors are shown in Figure, along with an illustration of Ohm's law. Most resistors used in practice are good approximations to linear resistors for large ranges of current, and their i-v characteristic (current versus voltage plot) is a straight line.

The value of resistance is determined mainly by the physical dimensions and the resistivity ρ of the material of which the resistor is composed. For a bar of resistive material of length l and cross-sectional area A the resistance is given by

960_Resistance.png

where ρ is the resistivity of the material in ohm-meters ( · m), and σ is the conductivity of the material in S/m, which is the reciprocal of the resistivity.Metal wires are often considered as ideal

380_Resistance1.png


Related Discussions:- Define resistance in lumped-circuit

SUPERPOSITION THEOREM, CONCLUSION IN BRIEF OF SUPERPOSITION IN ASSIGNMENT

CONCLUSION IN BRIEF OF SUPERPOSITION IN ASSIGNMENT

Rftfrfr, #questionfrfrfrfr..

#questionfrfrfrfr..

.., Among copper and mercury which is better conductor of electricity?

Among copper and mercury which is better conductor of electricity?

Semiconductors, Charge density In a semiconductor

Charge density In a semiconductor

Calculate the magnitude of fault current, Figure shows an isolated three-ph...

Figure shows an isolated three-phase load supplied from a 33 kV/11 kV substation via a 30 km long three-phase 11 kV overhead line. The overhead line has the following series parame

Digital frequency metre, what is digital frequency metre?working principle ...

what is digital frequency metre?working principle its operation and types application,advantages ,disadvantages

Distinguish between paramagnetic and diamagnetic materials, Distinguish bet...

Distinguish between paramagnetic and diamagnetic materials, mentioning at least one example of each. Paramagnetic Materials: The atoms of these materials have permanent magne

Explain about register marker, Q. Explain about Register marker? Regist...

Q. Explain about Register marker? Register marker: Stronger selectors perform searching and counting . Though, the crossbar switch has no ‘intelligence'. Something external to

Write some notes for the gauss-seidel method, Write Some Notes for the Gaus...

Write Some Notes for the Gauss-Seidel Method? 1.  Equation below is used to calculate the voltage at each busbar in turn, always using the most up to date values for the other

Diode, positive diode and negtive diode cliping

positive diode and negtive diode cliping

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd