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

What are the different types of distributing frames, Q. What are the differ...

Q. What are the different types of distributing frames used in exchanges? Ans: Different distribution  frames  used  in  exchange  are  displayed in  figure.  Each subscribe

Matlab simulation, Simulate and compare BER of QPSK system and 4-QAM system...

Simulate and compare BER of QPSK system and 4-QAM system without grey coding Eb/No=0.2.4.6.8.10

Determine the air-gap flux density, Q. A four-pole dc generator is lap woun...

Q. A four-pole dc generator is lap wound with 326 armature conductors. It runs at 650 r/min on full load, with an induced voltage of 252 V. If the bore of themachine is 42 cmin dia

Realization of digital filter design, why we are going to realization of di...

why we are going to realization of digital filter after finding the H(z).

Determine the armature current and power factor of the motor, A three-phase...

A three-phase, wye-connected, 2300-V, 60-Hz, round-rotor synchronous motor has a syn- chronous reactance of 2 per phase and negligible armature resistance. (a) If the motor tak

Obtain complete solution for the current for given circuit, For the circuit...

For the circuit of Figure(a), obtain the complete solution for the current i L (t) through the 5-H inductor and the voltage v x (t) across the 6- resistor.

Determine modulation index, Q. If the output signal fromanAMmodulator is gi...

Q. If the output signal fromanAMmodulator is given by u(t) = 5 cos 1800 πt + 20 cos 2000 πt + 5 cos 2200 πt , determine: (a) The modulating signal m(t) and carrier c(t). (b)

Measurement, Why delay circuit used in CRO?

Why delay circuit used in CRO?

Lt metering or low tension metering, LT Metering or Low Tension Metering ...

LT Metering or Low Tension Metering The subsequent types of meters are generally used for LT consumers: Whole Current Meters i)   Single phase meters ii)   3-phase

Evaluate phase difference between voltage and current, Evaluate Phase diffe...

Evaluate Phase difference between voltage and current: An inductive coil of reactance 15.7 Ω and resistance 32 Ω is connected in series with a capacitor of reactance 79.5 Ω. T

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