Maximum power transfer in dc circuit, Physics

Assignment Help:

Maximum power transfer:

Every source of EMF has internal resistance.  If it is required to develop the maximum possible amount of power in an external load, then the load resistance must be equal in value to the internal resistance of the source.

This may be shown by calculating the power developed in RLoad for different values of RLoad.

2348_maxmimum power transfer.png

This illustrates that maximum power is developed in the load when RLoad equals RInternal.

Matching is very important in electronic circuits which usually have a fairly high source resistance.  A typical example is the 'matching' of a loudspeaker to an audio amplifier.  Note however that:

  • For a power source with variable internal resistance and given load (RL), the smaller the internal resistance, the higher the power transfer to the load. The highest power transfer is achieved here when the internal resistance is zero.

Batteries, generators and other power supply systems are not operated under maximum power transfer conditions, since to do so would result in the same amount of power being dissipated in the source as was supplied to the load, which is wasteful of energy.  Thus power systems are designed to have the minimum internal resistance to minimise loses in the power supply 

 


Related Discussions:- Maximum power transfer in dc circuit

Describe process for realization of plane polarized light, Briefly explain ...

Briefly explain how elliptically and circularly polarized light is generated. Describe the process for realization of plane polarized light from elliptically polarized light.

What are characteristics of an ideal operational amplifier, What are differ...

What are different characteristics of an ideal operational amplifier?  Ans: Characteristics of an ideal Operational Amplifier: (1) Infinite voltage gain A (2) Infinite

Determine the power absorbed by the circuit, A 20 Ω non-reactive resistor i...

A 20 Ω non-reactive resistor is connected in series with a coil of inductance 80mH and negligible resistance. The combined circuit is connected to a 200V, 50Hz supply. Calcula

Gravitational force, A body of mass 2 kg thrown vertically upwards with a v...

A body of mass 2 kg thrown vertically upwards with a velocity 40 m/s comes to instantaneous rest at a height 50 m. Is there any other force (other than gravitational force), if yes

Batteries used in the torch lights, Can the batteries used in the torch lig...

Can the batteries used in the torch lights be recharged after their discharge? Give reason? Ans) No,because the NH4Cl corrods the zn containger gradually.so with out anode redox

Help, calculating work

calculating work

Physics, What is Fresnel explanation of optical activity

What is Fresnel explanation of optical activity

What effect does this have on eclipses, Q. If the moons orbit is inclined s...

Q. If the moons orbit is inclined somewhat relative to the Earth's orbit what effect does this have on eclipses? Answer:- This makes eclipses rarer as well as if the moon's

Magnetic induction, A particle with charge q and mass m is shot with K.E ''...

A particle with charge q and mass m is shot with K.E ''k'' into the region between two plates.If magnetic field between plates is B.How large B must be if the particle is to miss c

Important facts of laue experiment on x-ray diffraction, Q. Write down two ...

Q. Write down two important facts of Laue experiment on X-ray diffraction. The Laue experiment has established subsequent two important facts (1) X-rays are electromagnetic

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