Electrical Engineering

It would probably spin, but I don't know if it'd last very long.

First, the speed of AC motors typically are dependent on the frequency ( 50 Hz or 60 Hz) so the motor would be trying to spin 20% faster than designed.

Also, because of the higher voltage, you would have more current running through the motor windings (wiring) than designed. These 2 conditions would cause overheating of the bearings as well as the wiring inside the motor.

hi...

to determine the high fault current when the short circuit done at the output terminal of the generator...

more information check any book of power element analysis and chapter (three phase fault at unloaded generator)...

with my Greetings

well how big is the candle? which material is it made out, and how long does the candle burn?

The automatic door has a special infrared sensor in which a person walks towards the door then the sensor detects that someone in there, it then activates the electromagnets in the entrance system which allows the door to open at at certain speed.

Generally for export only transformer, generator side is connected in delta and load side is connected in star. For export import transformers star star connection may be preferred by some since this avoids a grounding transformer on generator side and perhaps save on neutral insulation. I am not sure how correct this practice is but so many systems are running in this configuration. Perhaps it may be felt to be less harmful than operating delta system incorrectly. Yd or Dy connection is standard for all unit connected generators.

The main reasons for connecting generator side winding in delta are:

1) To facilitate grounding of generator system with higher impedance and the load system with lower impedance.

2)To break The zero sequence circuit for the system at the transformer. This ensures the load side zero sequence currents do not come to the generator system.

3) III rd and similar harmonics will circulate in delta and will not come to generator system.

The trafo vector group will be Dy if load voltage is lower and Yd if load side voltage is higher.

Dy1,5,7 or 11 selection depends on requirement for load synchronizing ,standardizing or ready trafo availability. All vector groups are functionally similar.

Wouldn't this depend on the voltage of the system? Like if it is a 460 or 208v system it would be 208 or 460v. There should be 3 lines L1 L2 and L3 all measure the input voltage. The wye or star point voltage on a three phase system is the square root of three. This number (1.73) is divided into the three phase voltage to get the voltage to neutral (ground). 208/1.73 = 120 volts, 415/1.73 = 240 volts, 480/1.73 = 277 volts, 600/1.73 = 347 volts.

Using Ohms law ... E = I * R

Where

E is electromotive force in volts

R is resistance in Ohms

I is the current in amps (why "I", I don't know maybe some one else can edit this line)

E = 2 amps * 10 ohms = 20 volts

It is number 4 copper wire that is generally equivalent to number 2 aluminum wire as regards its ability to handle current. Voltage is not an issue with the conductor but, rather, with the insulation. The length of the run is immaterial ifthe original wire size for aluminum was correctly specified for the application. Think this through and it should make sense. Note that if you are considering an upgrade from aluminum to copper, you would be wise to do just a bit more research. Freelancing in electrical work without knowing all the facts can result in property damage from fire. Death is also a possibility, either from the effects of the fire, should one occur, or from electric shock. These eventualities can result from even the most simple mistakes in a job like this. Do all your homework before proceeding, and talk to at least two electrical contractors before strapping on your tool belt. Show everyone how smart you are and hire the job out to a qualified professional if you even think you have any doubts about what is involved in the undertaking.

This is because the current kills the magnetized/domain particles and so it becomes un-magnetized.

When the domains are magnetized they all face the direction of the magnet but when they have been destroyed by an AC current... they are pretty much jumbled together!

It isn't necessarily so. The capacitive voltage is the product of the current and capacitive reactance, while the inductive voltage is the product of the current and the inductive reactance. So it depends whether the capacitive reactance is greater or smaller than the inductive reactance!

Kilo simply means 1000. Volt-ampere (VA) is a measure of power, similar to the watt. Volt is a measure of voltage, or electrical pressure. Voltage means electricity is available, but unless it is actually used, no current (amperes) flows, and no work (power) is done. Suppose you have a motor that needs 1000 volts to run, and when it is on it draws one ampere (amp) of current. We would say the motor supply voltage is one kilovolt. When the motor is running, we would say it uses one kilovolt-ampere (1KVA) of power (1 ampere * 1000 volts = 1000 VA or 1 KVA).

Inductance

You can easily create an induction loop by getting some good quality wire, and twisting it around into a loop (i.e. a "2 turns series"). This can be used to improve the signal on your radio or television.

BS7671:2008 Requirements for Electrical Installations: IEE Wiring Regulations, 17th Edition. Strictly speaking, this document is published by the IET -the Institution of Engineering and Technology, as the IEE (Institution of Electrical Engineers) no longer exists.

200 and 100

10 volts divided by 30 ohms is 0.33333 amperes.

10 volts times 0.33333 amperes is 3.3333 watts.

Note: Resistance is dependent on temperature. 3 watts is enough power to raise the temperature enough to affect the resistance, changing the results.

If you stretch a wire, it would become longer, and therefore thinner. The cross sectional area will decrease and so the resistance will increase.

in the real world, if it's stranded wire, the strands will likely break. Solid wire would not stretch evenly, and in either case insulation will tear, so I wouldn't recommend stretching a wire.

A basic capacitor is made up of two conductors separated by an insulator, or dielectric. The dielectric can be made of paper, plastic, mica, ceramic, glass, a vacuum or nearly any other nonconductive material. Some capacitors are called electrolytics, meaning that their dielectric is made up of a thin layer of oxide formed on a aluminum or tantalum foil conductor.

Yes, you can use three single phase transformers on three phase applications and interconnect them to serve as a single transformer or you could use one single phase transformer fed from two of the three lines in a step down application.

The simplest way to start a three-phase induction motor is to connect its terminals to the line. In an induction motor, the magnitude of the induced EMF in the rotor circuit is proportional to the stator field and the slip speed (the difference between synchronous and rotor speeds) of the motor, and the rotor current depends on this EMF. When the motor is started, the slip speed is equal to the synchronous speed, as the rotor speed is zero (slip equal to 1), so the induced EMF in the rotor is large. As a result, a very high current flows through the rotor. This is similar to a transformer with the secondary coil short circuited, which causes the primary coil to draw a high current from the mains. When an induction motor starts DOL, a very high current is drawn by the stator, on the order of 5 to 9 times the full load current. This high current can, in some motors, damage the windings; in addition, because it causes heavy line voltage drop, other appliances connected to the same line may be affected by the voltage fluctuation. To avoid such effects, several other strategies are employed for starting motors.

Depending on the size of the transformer, it can be protected by fuses, thermal elements, or by a full relay protection package, which could include overcurrent relays, differential relays, and distance relays.

The On/OFF action in UJT is controlled by emitter current

Electrical Energy

A transformer is a passive device while an amplifier is an active device. a transformer can amplify voltage but never power WHILE AN AMPLIFIER CAN amplify power's can you use it sure withing the limitation of the transformer and only to amplify volts.