how a electrical transformer works ?
448145
Transformers do not store energy, that would be a battery or a capacitor.  Transformers work by wrapping wire around an iron core that is basically a circle.  For each wrap of the wire on the input side, you divide the total number of wraps into the voltage. If the input is 120 volts, and you have ten wraps, you get 12 volts per wrap.  Then, on the output side, you get an equivalent voltage per wrap.  So, that means on the example I gave, if you have five wraps on the output side you get 60 volts.  (5 x 12 volts = 60) This example would be a step down transformer, because you have a lower voltage than you started with.  If you have 20 wraps on the output side, you would get 240 volts. (20 x 12 volts = 240)  This is a step up transformer.  Note: Using Ohm's Law, you do not actually increase the total amount of power available, only change it's configuration.  Thank you, Nikola Tesla, inventor extraordinaire.
9381
a hyrdo electric generator works by using water current flowing againsnt a wheel that in fact turns the generator wheel creating electricity, just like when you put your hand against a current it opushes against your hand, except its being diredcted twards a wheel that catches that current turning it into energy
260861
Think of the analogy between the flow of electricity and water where voltage is pressure and current is water flow.  It take voltage (pressure) to cause current (water flow).  Therefore, current (water flow) will occur in the direction under greatest voltage differential (pressure).  Because you may be working with more than one voltage source (two transformers or ttwo battery cells?) one of the sources may be adversely affected.  Are you working with AC or DC?  You may need to avoid connecting a circuit for example that would be like charging a car battery with the leads reversed.  Good luck.
694070
because it's not referenced to ground to begin with.\nbut if you have a wye to delta transformer then the wye transformer will be referenced to ground (center tap).\n\nDelta transformers are for more of the industrial (large 3 phase motors) application anyway.  hence there really is no need to reference it to ground.
1074739
what is your question?\n\nA 220 Volt Circuit works the same as any other voltage.  Voltage pushes electrons and work is done.
1105032
The atoms of iron line up with the magnetic field produced by the changing voltage.  This prevents the magnetic field (and thus, electric field) from decresing so quickly  This effect greatly increases the efficiency of the transformer.
443133
hi,\n\ntransformers you can buy for pretty cheap at any decent electronics or  hobby stores (radio shack sucks these days, but they probably still have them).  \n\nhowever you can make them really easily.  all you need is a hunk of steel or iron (some kind of rod-shaped thing would work, as would a donut-shaped loop).  take one wire and wind it around the piece of steel N times.  take another wire and wind it around a different part of the steel M times.  congratulations, you have just built a transformer that will step up/down voltages by a factor of M/N (or N/M, if you hook it up the other way.)\n\ncheers-
829247
One would think it is a dead short.  But since the wire is coiled up around a soft iron core it forms a good sized inductor.  Since the voltage applied is a sinusoid of 60 Hz, the inductor acts as an additional impedence to current.  So you have the resistance of the thin gage wire plus the impedence of the inductor to keep things from shorting out.\n\nIncidently, when the secondary side of the transformer is conducting current, the effect of the inductor on the primary side is reduced.  So more current flows in the primary side to provide the power required by the secondary side.
265159
Yes. liquid/fluids have some property called Dielectric Strength, which upon breaking this strength by increasing/applying enough voltage, it conducts electricity.\n\nIn transformers, Oil is used as sheild (insulation) between the coils. But a transformer can burn out when subject to huge voltage that it breaks the oil dielectric strength.\n\nSalt water conducts electricity very well. Do not stand high above the electricity lines and piss over the wires. You will sure die. :)\n\nBut PURE WATER DOES NOT CONDUCT ELECTRICITY.
206554
1 amp (1000 millamps) is the maximum rated operating conditions for the transformer.  You may be able to get more current than that from the transformer, but the rest of its specifications (such as output voltage, operating temperature, efficiency, etc) are no longer guaranteed to be accurate.\n\nIt would be a good idea not to exceed this current draw if you want the transformer to last, and not pose a fire danger.  Consider using a fuse in your circuit to prevent overcurrent conditions.
1172658
Actually it's a question in physics. I will try to explain it anyway:\nassume we have two windings w1 and w2 with  n1 rounds and n2 rounds respectively. If an A.C. voltage of V1 is connected to w1 then a voltage V2 will be induced in w2, satisfying the following equation:\nV1/V2=n1/n2 and for currents we have: I1/I2=n2/n1\nand it doesnt convert ac to dc to do so we should use a rectifier such as bridge rectifier etc
240140
The tesla coil generates high voltage electricity at high frequencies.\n\nLots more details here...\nhttp://en.wikipedia.org/wiki/Tesla_coil
152613
How it works\nThe Van de Graaff generator is powered by a high speed electric motor. It has a belt running on two pulleys. The lower pulley is made of an insulating material and the upper pulley is made of metal. There is a grounded comb close to the belt in front of the lower pulley, and another inside the terminal, close to the belt in front of the upper pulley, connected to the terminal.\n\nAdhesion between the belt and the lower pulley charges the pulley, and it attracts opposite charges to the outer surface of the belt from the grounded comb. The belt then transports these charges to the terminal, where they are collected by the upper comb and transferred to the terminal. The shielding provided by the terminal allows the continuation of the process even if the terminal is already strongly charged. The high speed of the belt, along with the large discharge electrode, allows the continuous buildup of charges and great voltages to be achieved.
665401
hi,\n\nas i understand it, the way a DC-DC converter operates is in 3 stages:\n\nfirst, V_in is used to drive a pair of coupled transistors (or some other oscillatory circuit) that output a square wave or some kind of time-varying oscillatory voltage.\n\nsecond, that AC signal is used to drive a transformer which consists of two inductors.  the ratio of the number of turns in the primary and secondary windings of the transformer determines the step-up or step-down ratio of the transformer.  if you have a 3:1 inductor then you will step down the voltage by a factor of 3, for example.\n\nthird, the transformed AC signal gets converted to DC by a bridge rectifier or some other AC->DC circuit.  generally speaking, a bridge will output a DC voltage that is simply proportional to whatever AC you put into it.  (of course if you way over- or under-drive it, it won't work right.)\n\nanyway, if you have a single missing turn on either side of your transformer, that will change the step-up/down ratio.  my 3:1 example would become a 2:1 transformer and then you'd get an output voltage that was too high (1/2 of the input, instead of 1/3).  \n\nthen the rectifier will just flatten out whatever voltage you put into it.\n\nhope this helps!
1050051
Technically, you don't convert mA into VA in any AC circuit!  One is a measure of current flow, the other is a measure of power.\n\nNow if you want to figure out the power of the transformer, simply multiply the amperage by the voltage.\n\nP = 12V X 800mA = 12V X 0.8A = 9.6 VA or 9.6 watts.\n\nNow you can think of the power in terms of VARs (volt amp reactive), but those are typically used in where you have either a(an) inductive and/or capacitive load and use imaginary numbers to solve such problems.
362491
A transformer style welding machine converts the high voltage and low current electricity from the utility into a high current and low voltage, typically between 17 to 45 volts and 190 to 590 amps. This type of machine typically allows the welder to select the output current by either moving the core of the transformer in and out of the magnetic field or by allowing the welder to select from a set of taps on the transformer. These machines are typically the least expensive to purchase for hobbyist use.
73433
a generator is technology based on the scientific phenomenon that is today known as faraday's law.    \n\nif you have a loop of wire and you stick it into a magnetic field, well, then you'll have a loop in a magnetic field.  no big deal.  but if you then do something that changes the magnetic field somehow - either by changing the strength of the field, or its orientation relative to the loop - then if you are paying attention to such things you will notice that there is suddenly a current flowing in the wire.  and when you stop moving the field around, the current stops flowing.  faraday's law is a mathematical statement of this observed natural phenomenon, which is called induction.\n\nanyway, a generator is a thing that uses induction to convert mechanical energy to electrical energy.  it is basically what i just said - some big permanent magnets arranged such that there is a region of space with a strong magnetic field between them - and some big coil of wire in the middle.  \n\nthis coil is attached to a rod which leads out of the device and to a handle, or gears, or engine or turbine, or basically some -thing- that makes it spin.  the mechanical energy of the spinning is then converted into electrical energy, which drives the current in the loop, and powers whatever electrical device the two ends of the loop are attached to!\n\nand, basically that's it.  because the coil goes around and around, the current flows back and forth in a sine-wave pattern, and that's why generators are used for making alternating current, which is what is in the power grid and the walls of your house.\n\nnote that an electric motor is essentially a generator that operates in reverse - you connect some driving AC voltage to the coils, and the changing current causes a magnetic field to form which opposes that of the permanent magnets, so (as anyone who has ever played with magnets will tell you) there is a considerably strong force that pushes the coil away from the magnet.  with proper design you can make it keep pushing itself all the way around a circle, and voila, you have a motor.