Maximum power transfer in dc circuit, Physics

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 

 

Posted Date: 9/13/2012 4:10:07 AM | Location : United States







Related Discussions:- Maximum power transfer in dc circuit, Assignment Help, Ask Question on Maximum power transfer in dc circuit, Get Answer, Expert's Help, Maximum power transfer in dc circuit Discussions

Write discussion on Maximum power transfer in dc circuit
Your posts are moderated
Related Questions
Ball bearings Place some marbles in the lid of a tin on the floor. Put single foot on the marbles and notice how simply you can spin round.

Prism: A transparent refractive device having of three rectangular and two refractive surfaces is known as prism. N = Sin (A + Dm) /2               Sin A/2 Where a is



Attraction & repulsion of atom: It can be observed, that if two negatively charged bodies are brought together, there is a force of repulsion between them. Similarly if two p

The record for the highest speed achieved in laboratory for a uniformly rotating object was 2.01*10^3 m/s for a0.15-m long carbon rod. What was the period of rotation of the rod?

Explain Circular and Orbital Motion Let's start by looking at circular motion with constant speed. Can there be acceleration in this problem? Yes, velocity includes speed and

What is electric field and formula for electric field is?

Explain why easier to pull a lawn roller than to push it? Explaination :  In Pulling, effective weight of lawn mover= mg-fsinx In pushing, effective weight = mg+

Q. An object of size 3.0 cm is placed 14cm in front of a concave lens of focal length 21 cm. Describe the image produced by the lens. What happens if the object is moved further aw