What is Power transfer: Definition and 76 Discussions

Energy transformation, also known as energy conversion, is the process of changing energy from one form to another. In physics, energy is a quantity that provides the capacity to perform work (e.g. Lifting an object) or provides heat. In addition to being converted, according to the law of conservation of energy, energy is transferable to a different location or object, but it cannot be created or destroyed.
The energy in many of its forms may be used in natural processes, or to provide some service to society such as heating, refrigeration, lighting or performing mechanical work to operate machines. For example, to heat a home, the furnace burns fuel, whose chemical potential energy is converted into thermal energy, which is then transferred to the home's air to raise its temperature.

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  1. K

    AC Maximum Power Transfer question

    Homework Statement In the circuit attached the load impedance ZL comprises a resistor in parallel with a capacitor. Determine the value of the resistor and the capacitor to ensure that the maximum power is received by the load impedance. The Attempt at a Solution So,if components in ZL...
  2. T

    Max Power Transfer Homework: Solve for RL & Calculate Pmax

    Homework Statement Determine the value of RL that will draw the maximum power from the rest of the circuit shown below. Calculate the maximum power. (This problem was included in our exam this week, and I don't really recall the exact values of the parameters, but I'm pretty sure that the...
  3. F

    Maximum power transfer vs Max power efficiency

    Hello forum, what is the main difference between max power transfer and max power efficiency? In the case of max power transfer, the goal is to transfer the most energy to the load per unit time (impedance matching). Power is I*V and is about delivering energy very fast... High power...
  4. G

    Maximum Power transfer theorem ( Power dissipation in resistors in circuits)

    the equation P = (E2R) / [(R-r)2 + 4Rr] We say that when R=r , P = E2/4R which is said to be maximum.. But if I say R→∞ , then r→0 and then P = E2/R which is greater.. So, shouldn't power be maximum for max R ?
  5. D

    Wireless Car Battery Charger: Inductive Power Transfer Tips

    Hi, I am planning to build a wireless charger to charge up car battery. I am wondering what to do to the secondary coil in order to have enough energy to charge the battery .. thank you.. ^^
  6. S

    Discover the Best Books for Learning Wireless Power Transfer | EEE Student

    Hi, Iam doing my 3rd yr in EEE,i am interested in learning about wireless power transfer.Can someone suggest me some good books.
  7. E

    Net Power Transfer by Radiation

    Homework Statement A person with a skin temperature of 33 C and an emissivity of .9 is in a room at 24 C. What is the net power transfer by radiation. Let the area of the body be 1.8 m2. Homework Equations I=\frac{P}{A} \DeltaIrad=\epsilon\sigmaT4 (Stefan-Boltzman Law) The Attempt...
  8. PainterGuy

    Understanding maximum power transfer theorem

    Hi :) I'm trying to understand 'background' working of the maximum power transfer which says that power transfer takes place across R_L when it is equal to R_th (R_L is load resistance and R_th is Thevenin resistance). It is easily proved by doing some math. P=VI, P=I^2.R, P=V^2/R...
  9. R

    Calculating Power Transfer of a Medium Carbon Steel Shaft at 150 rpm

    Homework Statement Calculate the power that can be safely transferred by a medium carbon steel shaft of 100 mm diameter at 150 rpm ? Homework Equations Assumed solid circular shaft. The Attempt at a Solution Material : Medium Carbon steel t=580 MPa y= 50 mm k=6 ( table 9...
  10. A

    Max Power transfer Mechanically?

    In electrical circuits, maximum power transfer is obtained when you have your impedances matching? What would be the analogue, or equivalent requirement in order to maximally transfer power in a car or mechanical device. For a given gear ratio, there must be an optimal speed that maximally...
  11. D

    Find L & C for Maximum Power Transfer to Load Resistor

    Homework Statement Find L & C so that maximum power is delivered to load resistor. ___l 50 ohm l___ ( inductor L )____.____ ( inductor L )___ l . . . . . . . . . . . . .. . . . . . . . . . . l . . . . .. . . . . . . . . . l 10 V ac source . . . . . . . . ( Capacitor...
  12. S

    Impedance matching vs max power transfer criterion

    Hello, I wonder if there's any difference between the "impedance matching" and "maximum power transfer" criterion? I assume in both cases, one impedance should be designed to be the complex conjugate of the other. Thanks.
  13. B

    Smith Chart and Maximum Power Transfer

    Homework Statement You can find the problem http://whites.sdsmt.edu/classes/ee382/homework/382Homework9.pdf" . It is problem 9.2. Homework Equations Zin = Zs* (maximum power) The Attempt at a Solution I've already figured out the first part of this problem. I plotted the normalized...
  14. P

    Maximum power transfer theorem

    i was solving one question...it said find out value of r in a circuit so that the 6 ohm resistor consumes maximum power...i applied max power theorem ...and calculated the thevenin eqivalent resistance accrss 6 ohm resistance...and put it equal to 6...but the r cam eout to be negative...so wat...
  15. N

    How Does Power Transfer to a Capacitor in a High-Voltage RC Circuit?

    Hi, Me again. I have been tasked to replace a step up power transformer in a machine. But i just can't get the answers i need after much thinking. In a simplistic RC circuit, there are 4 items DC Power source (Normally voltage driven) Switch (On/Off the circuit) Resistor Capacitor...
  16. R

    Maximum power transfer theorem

    show that the power absorbed by the load is half the power delivered by source when the load and source impedances are conjugates.
  17. D

    Impendance matching and power transfer

    What is the physical explanation for the power transfer in a circuit being maximum when the resistance of the system is equal to the internal resistance? maybe heat loss? any help would be appreciated as i understand the mathematical proof but do not know much about the physical causes.
  18. D

    Power transfer and impedence matching.

    What is the physical explanation for the power transfer in a circuit being maximum when the resistance of the system is equal to the internal resistance? maybe heat loss? any help would be appreciated as i understand the mathematical proof but do not know much about the physical causes.
  19. R

    Troubleshooting Wireless Power Transfer Circuit: What Am I Doing Wrong?

    Hi all i'm trying to build a circuit which can transfer power from one inductor to another inductor unfortunately its not working as i expected. basically what i did was to make 2 inductors of 1000 turns (copper) on a plastic core.i connected one of the inductor to an ac power source...
  20. Q

    What is the maximum power transfer equation?

    hello!well i have the exercice below(attachement) and i need to find the maximum power transferred to Rl..how can i do this without even knowing the value of Rl? thank you
  21. A

    Max/Min power Transfer In String concept check

    Homework Statement We have a transverse sinusoidal wave being generated in a long horizontal string. The transverse displacement is described by: y(x,t) = 0.01sin(27.3x - 240\pi t) What is the displacement when the maximum and minimum power transfer occurs? Homework Equations...
  22. K

    Understanding the Speed of Power Transfer in Electrical Currents

    Hi I've a small doubt regardin the speed of power transfer.v know tat electric current produces electric and magnetic field around it. So is it an EM wave? if its so then it should travel at velocity of light right? on the other hand the speed of electrons in a conductor is around 10^6 m/s...
  23. G

    Multiple Pulley Power Transfer

    I would like to drive two identical devices off of 1 power source. I would like to use two independent but equal sized V-belts, a double stacked pulley on the drive shaft and a single pulley on each of the device shafts. If the power source has a rating of 36HP @ 3600 RPM, what is the maximum...
  24. J

    Power transfer by IPT questions

    I am using this circuit below to charge a AA battery at the receiver's output. i think it should at least have some readings but i was wrong. there was no results at all. is there something wrong in my design. I've took the basic circuit only(hadnt add the control devices). PS I am a noob at...
  25. L

    Inductive power transfer + sensing resistance via inductance ?

    I am attempting to pass current from a static part to a moving part via induction across a 1 mm air gap. Once that works I would like to use the current on the moving part to power an IR LED pointed at a mated IR sensor and then receive the resistance value from the IR sensor and pass the...
  26. S

    Can LEDs be used for power transfer in this application?

    Numbers Having "googled" into this thread, I was hoping you could help with my own "LED lighting" question. I have a cost-sensitive instrument application where I need to supply roughly 50mW to an assembly rotating on a motor shaft, about 6mm from the nearest support. I wondered if I could...
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