Maximum power Definition and 83 Threads

Homework Statement How many resistors, R = 70 ohms can be connected in a series circuit when the maximum power loss of the circuit is 1800W. and the voltages supply is 127V Homework Equations Number of resistors! The Attempt at a Solution P = V2 / x*R x*7=1272/1800 x=1.28 so...

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...

Is there any equation for calculating the maximum power possible for a given 4 stroke engine? per cylinder. I guess it would involve: Octain rating of fuel used RPM CC some factor of bore X Stroke And an efficiency of 100%!

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...

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...

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 ?

Homework Statement This is the network. The problem states that a new resistor is put between A and B, in parallel with R4. I should find the ideal resistance for this load resistor and show that this is indeed the ideal resistance for maximum power output. Homework Equations...

Homework Statement What is the power the drill can supply at the two points of interest(The intersections at the axis') This is a direct translation of the dutch problem. So basically what's going on is we made measurements of the RPM and angular displacement of our mechanical system...

Homework Statement Please see my attachment. From the circuit Energy transferred to the load E = Ir + IR, where r is the internal resistance and R is Load Resistance. so I = E/(r+R) Homework Equations The Attempt at a Solution The Power W is W = I2R = E2R/(r+R)2 Upto this i...

Homework Statement In Figure 1, the transform is perfect (k = 1). Calculate the maximum power which can be transferred to the load ZL. Design a dipole which that power can be transferred to. Homework Equations k = 1 --> n = sqrt(L1/L2). Pmax = |V(rms)|/(4*Rg) The result must be Pmax = 0.368 W...

MTW has a cute argument on p. 980 that the maximum power radiated from any system is a fixed number, about 10^53 W. I came across this and filed it away as a piece of cool trivia. But it turns out that apparently you can derive the GR field equations from nothing more than the assumption that...

there are 3 resistors of, different values. 470o,22o and 100o. but each one is 500W I want to connect them in series/parallel in order to dissipate the maximum power 500W. I have connected 4,22o in series and 2, 100o in series, 1, 470 in parallel. but the dissipation is not maximum. the...

[b]1. A loaded ore car has a mass of 950 kg and rolls on rails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at 30.0° above the horizontal. The car accelerates uniformly to a speed of 2.20 m/s in 12.0 s and...

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...

The maximum power that a train A of mass m can exert when traveling at a velocity v is Pv^{3/2} where P is a constant. The resistance to motion is kv. Why is the equation of motion of A at full power given by: Pv^{1/2}-kv=m\frac{dv}{dt}?

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...

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...

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...

Homework Statement My physics teacher (i'm in year 12) set me a "challenge" to prove a graph in our textbook, which shows Power against Resistance, with a local maximum where R = internal resistance, r. He told me i'd need to use differentiation, P = I^{2}.R and said that I was right in...

Homework Statement A solar-thermal power plant is to be built in a desert location where the only source of cooling water is a small creek with average flow rate of 100kg/s and an average temperature of 30 degrees C. The plant is to cool itself by boiling away the entire creek. If the...

Homework Statement (a) For the circuit below, the value of R is adjusted so that each of the two 10Ω resistors dissipates 10W. Calculate the value of the variable resistor R. (b) What is the value of R if it is adjusted to dissipate the maximum power possible? For this value of R...

I'm doing some practice problems, and I can't seem to figure out where to even begin with this one. I've tried solving for R_{T} (Thevenin resistance) by removing the 9V source and adding a 1V test source across the load, and I've also tried solving for R{_T} by leaving the 9V source in the...

Homework Statement http://img63.imageshack.us/img63/80/circuit1.jpg Homework Equations P = (I^2)(R) The Attempt at a Solution First, I turned the 2A and 4A current sources into voltage sources by V = IR. So (2A)(10Ω) = 20V and (4A)(12Ω) = 50V Then I had the circuit simplified...

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

Homework Statement A battery of emf [insert symbol for emf here] and internal resistance is hooked up to a variable "load" resistance R. If you want to deliever the maximum possible power to the load, what resistance should you choose?(You can't change the emf and r, of course). Homework...

I need some help to understand the maximum power theorom. From what I understand it states that in order to get maximum power from a source you have to match the resistance of the source to the resistance of the load. Now what i don't understand is how could adding resistance to a load generate...

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

1. http://img503.imageshack.us/img503/1480/21144697lh1.jpg [/URL] 3. Pmax = Vth^2/4Rth so I am guessing i treat R as the Rth and find Rth. to find Rth i must turn off all independent sources. Since the dependent source exists i added a one voltage source at the Rth terminals and put a...

Homework Statement Bob can throw a 500 g rock with a speed of 30 m/s. He moves his hand forward 1.0 m while doing so. a. How much work does Bob do on the rock? b. How much force, assumed to be constant, does Bob apply to the rock? c. What is Bob's maximum power output as he throws the rock...

Hi, I need with the following question. Argon gas expands in an adiabatic turbine from 3MPa and 750 C to .2 MPa at a rate of 5 kg/s. Neglect KE and PE effects. Find maximum power output. I know I need to first find the temperature of state two and then use that to solve for h2 (I have...

Explain why the torque developed at maximum power is less than the maximum torque maximum torque of 165 Nm at 4300 rev/min and its maximum power 88 kW at 5500 rev/min Torque developed at maximum power T = bp x 60 2pN = 88000 x 60 2 x p x 5500 = 152.8 Nm...

Hey, i got a circuit question, and I'm not sure if i did it right, and was wondering if anyone could show me how to do it A 750W microwave oven is plugged into an outlet and turned on. All three lights are on. What is the maximum power rating of a kettle that could be operated in the other...

A loaded ore car has a mass of 950kg and rolls on rails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at 30 degrees above the horizontal. the car accelerates uniformly to a speed of 2.2m/s in 12 sec and...