What is Generators: Definition and 300 Discussions

In electricity generation, a generator is a device that converts motive power (mechanical energy) into electrical power for use in an external circuit. Sources of mechanical energy include steam turbines, gas turbines, water turbines, internal combustion engines, wind turbines and even hand cranks. The first electromagnetic generator, the Faraday disk, was invented in 1831 by British scientist Michael Faraday. Generators provide nearly all of the power for electric power grids.
The reverse conversion of electrical energy into mechanical energy is done by an electric motor, and motors and generators have many similarities. Many motors can be mechanically driven to generate electricity; frequently they make acceptable manual generators.

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I came across this statement in a generator manual I was reading(manufacturer Rolls Royce) The documentation barely touches any theoretical explanation as to how this works. I would like to ask specifically how this phenomena is achieved. If a generator's fuel output is increased, it produces...
2. Iterators and generators and the data they generate

Hello, I have been focusing on iterators and generators and I understood a lot but still have some subtle questions... An iterator, which is a Python object with both the __iter__ and the __next__ methods, saves its current state. Applying the next() method to an iterator gives us one item of...
3. Looking for References on Single Phase Generators

I am looking for a textbook or reference book that discusses single phase generators. All I can find are books that discuss three phase generators. Any suggestions?
4. Small-scale hydropower generators installed in irrigation canals

This is an interesting idea, with easier permitting and infrastructure advantages... https://www.cbsnews.com/sanfrancisco/news/hydro-power-generators-central-valley-irrigation-canals/
5. A Ballentine on construction of the (Galilean) symmetry generators

In Problem 3.7, Ballentine says: The unitary operator ##U(v) = exp(iv·G)## describes the instantaneous ##(t = 0)## effect of a transformation to a frame of reference moving at the velocity ##v## with respect to the original reference frame. Its effects on the velocity and position operators are...
6. Hydrogen dew point in power generators

Large power generators (for example 200 MW) are cooled by H2 in gas form. H2 temperature is +45 to +75 "C. So why hydrogen dew point is important in generator while the lowest hydrogen temperature is 45 "C? And in some Power Stations is monitored online... Thanks, a lot
7. I The different generators of canonical transformations

Consider the phase space of a one degree of freedom mechanical system. We can pass from one phase space coordinates to another phase space coordinates via a canonical transformation. I want to focus on 1-parameter canonical transformations, $$(q_{0},p_{0})\rightarrow(q_{\lambda},p_{\lambda})$$...
8. I Spin, Angular Momentum, Momentum, Energy & NRQM

Angular momentum is related to rotations. Momentum is related to spatial translations. Energy is related to temporal translations. Is spin related to anything? I only know the introduction to NRQM from Griffiths' book.
9. Help my understanding of DC generators please

Hello, I am currently working on a engineering project for school and have been tasked with researching the basics of electrical theory. We are building a small, portable hydroelectric generator for the purposes of charging a cell phone or other small electrical devices. I already have the motor...
10. Computing the infinitesimal generators for the Mobius transformation

I don't know where to start. I understand that the constraint ##ad-bc=1## gives us one less parameter since ##d=1+bc/a##. So we can rewrite our original function. I know how to compute the generators of matrix groups but in this case the generators will be functions. I also know there should be...
11. Why don't we use Direct-Charging Radioisotope Generators?

when I was browsing wikipedia for some atomic battery information for my school project I found the thing called Direct-Charging Radioisotope Generator and when I tried to find more information about it I did not succeed. So I came here for some information about it or at least an answer why...

34. Discrete logs and non generators

Homework Statement This is just a question that i can't seem to answer while reviewing... Is discrete log well defined when the base is not a generator? Homework EquationsThe Attempt at a Solution For example, ##2^3 \equiv 2^6 (\operatorname{mod} 7)##. Taking the discrete log of both sides...
35. SU(3) Cartan Generators in Adjoint Representation

I am trying to work out the weights of the adjoint representation of SU(3) by calculating the 2 Cartan generators as follows: I obtain the structure constants from λa and λ8 using: [λa,λb] = ifabcλc I get: f312 = 1 f321 = -1 f345 = 1/2 f354 = -1/2 f367 = -1/2 f376 = 1/2 f845 = √3/2 f854 =...
36. How does an Electric Bell use the Motor Effect?

I need help in explaining how electric bell uses motor effect.
37. I Do the SU(n) generators represent any observables?

Hey there, I've recently been trying to get my head around Yang-Mills gauge theory and was just wandering: do the Pauli matrices for su(2), Gell-Mann matrices for su(3), etc. represent any important observable quantities? After all, they are Hermitian operators and act on the doublets and...
38. What is the optimal RPM for charging a battery with an automotive alternator?

Hello, I have a very basic question. And, admittedly, my knowledge is limited in this field. It is about the rpm of a rotor inside a generator. I know, to be aligned with the existing grid, standard frequency (of 50Hz, Europe and 60Hz, US) will require the RPM to be 3000 and 3600 respectively...
39. I Confused About Lorentz Generators

I am looking at the generators of the Lorentz group. The literature commonly refers to the generators as Mij, Ji and Ki and defines: Ji = (1/2)∈ijkMjk I am confused about the factor of (1/2) in this equation as I thought that Mij is essentially the same as Ji This also shows up in Λ=...
40. Can waste CO2 be used to turn generators?

If waste CO2 is collected through a pipe from a power plant can it be used to turn a generator by increasing its pressure with a funnel? See diagram: I have been wondering whether this is possible as I feel it could be very useful in the energy industry.
41. Do AC generators make use of interpoles?

Hello, new member here. I'm giving myself a crash course and can't find a direct answer to my query outright, so here I am: Do A.C. generators make use of interpoles? I understand the concept of interpoles in D.C. machines, offsetting neutral plane shift; however, if we have, say, a brushless...
42. 2 Synchronous Generators in parallel connection

Homework Statement Two 3-phase 60-hertz 35-kilovolt synchronous generators (G1 and G2) each have synchronous reactances of j9 ohms per phase with negligible armature resistance. They are connected in parallel to supply a 36-megawatt load at rated voltage and power factor of 0.90 lagging...
43. L

I How many generators can a cyclic group have by definition?

Hi, so I have just a small question about cyclic groups. Say I am trying to show that a group is cyclic. If I find that there is more than one element in that group that generates the whole group, is that fine? Essentially what I am asking is that can a cyclic group have more than one generator...
44. How exactly do motors and generators work by using magnetic fields?

So I know if you move a charge in a magnetic field it induces voltage and hence a flow of charge is created which is current. ( Please correct me if I'm wrong). But that's pretty basic right. However, I'm having trouble understanding the use of split rings in the functioning of a motor. I would...
45. I

Vortex generators under your racecar question

let's say you have a street legal racecar, flat front splitter with undertray going back to front tire stock undercarriage with crooked exhaust and couplings and then a badass rear difuser from the rear tire to the bumper. Let's keep this about "under the car" question. Vortex generators do some...
46. I SU(2) Generators: Understanding Lie Algebra

Hello! I am reading some Lie Algebra and at a point the author says that for a vector with 3 cartesian components ##V_i## i =1,2,3 the commutation relations with the generators of rotation are: ##[J_i,V_j]=i\epsilon_{ijk}V_k##. Can someone explain this to me? I am confused as ##V_j## is a number...
47. C

B Why Negative Hydrogen/Deuterium Ion Generators?

Auto-Search gives me some hints. I did a Google for "Hydrogen Ion Generator" and got a load of hits about "Negative Hydrogen Ion Generators". They almost seem to be 'fusion specific'. Are they used because the required end result is a neutral beam of Hydrogen/Deuterium for injection into the...
48. Eddy current losses in microelectric generators?

For a microscale electric generator (where the driving force is a fraction of a Newton), can losses from eddy currents be significant enough to noticeably alter the rotational velocity of the rotor? Because my understanding is that the rotation is basically taken as a constant when examining the...
49. A Srednicki's normalization choice for lie algebra generators

IN Srednicki's QFT he seems to make two different choices for normalizing the generators of lie algebras. In chapter 24 (eqn 24.5) he chooses Tr (TaTb) = 2 δab and in chapter 69 (eqn 69.8) he chooses Tr (TaTb) = (1/2) δab Is there a reason for this? Is there any particular reason to make one...
50. String Theory-Virasoro Generators -- show commutator relation

Homework Statement (I have dropped the hats on the ##\alpha_{n}^{u}## operators and ##L_{m}##) ##[\alpha_{n}^u, \alpha_m^v]=n\delta_{n+m}\eta^{uv}## ##L_m=\frac{1}{2}\sum\limits_{n=-\infty}^{\infty} : \alpha_{m-n}^u\alpha_{n}^v: \eta_{uv}-\delta_{m,0}## where : denotes normal-ordered. Show...