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Electrical Engineering

Parent Category: Engineering
Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.

Subcategories

INDUCTIVE RESISTOR:Any circuit in which change in current is accompained by change in flux and therefore by inuced emf is said to be inductive.    NON-INDUCTIVE:if a double wire is wound arround an insulating rod,the emf can not be induced because the wire is doubled back on itself at its...
  It has been calculated that one big cheer from the spectators in a football stadium has enough energy to boil a cup of water. Now, although heating water takes quite a bit of energy, this actually isn't very much from so many people.   A microphone works by sound vibrations moving a coil...
With Daubechies you can use practical subband coding scheme. You don't have to no the actual wavelet and scaling functions, but rather you need to know low-pass and high-pass filters related to a certain Daubechies wavelet family.
High resistivity is the inverse of conductivity, and Carbon is not a good conductor (although it could be a better conductor than most hydrocarbons). Here are a few examples:Carbon - 0.07 x 106 S cm-1 (not a good conductor)Silicon - 1.2 x 10-5 S cm-1 (not a good conductor - used for this purpose in...
If the OLTC is on the secondary, and the secondary voltage is high, the OLTC will tap down, which will lower the voltage. Typical range of OLTC is +/- 10%. The primary may also have multiple taps so the OLTC can be set at '0' under normal conditions.
  Torque is the cross product of radius and force .Torque is a twisting effect.   Torque is the cross product of radius and force .Torque is a twisting effect.
A purely resistive load is one in which there is no capacitive or inductive reactance. Whe driven by an AC voltage source, such a load will have no shift in phase angle between voltage and current.
Yes there is single phase for 600 volts. It is used for lighting.  You need a transformer which gives you 600 volts plus a neutral.  The voltage for the one phase to neutral is 347.
  == Answer ==   its an amotor can work at both dc or ac supplies
parallel operation of generators is nothing but giving the same source of energy to the two or more units.
  it makes a rainbow!!!!!!!!!!!!!!!! :D
these instruments operate on the interaction between two magnet field.the signal current to be measured routed through a fine wire coil suspended in the field of permanent magnet.the coil wound round an aluminium frame which is a cylendrical soft iron core.a spiral spring connected to the pointer...
An open (circuit) is where insufficient (often zero) current flow where some is expected. In this case, little or no work is done. A short (circuit) is where high (often infinite or as limited by the power supply) current flows where only some is expected. In this case also, little or no work is...
A coil of wire is an inductor. It's power factor should be very near zero. It will not be zero, since the wire has real resistance as well as inductance.
1. You must size the conductors at 125% of the motor FLC 2. You must size the overloads from 115% to 125% of the motor nameplate current rating
Run another wire from the electrical panel.
kW = (V × I × PF × 1.732) ÷ 1,000. now if we assume unity PF and solve this equation for "I," we get: I = 1,000kW ÷ 1.732V.
It makes and breaks four separate contacts. Think of a switch for  example that connects one wire to one wire. A 4 pole contactor is  like 4 separate switches going on together.
This is a number that indicates what range the transmitter will  work correctly. This will depend on how strong the transmitter is.
Electrical engineering would include such things as transformers and switchgear, conductors, motors and generators; and almost always concerned with the energy component of electrical systems. House and automobile wiring and systems including lighting would also be included. Electronic engineering...
If there are 4 ammeters in a parallel ciruit and one reads 0.8, the readings of the rest are indeterminate, because it depends on the individual branch resistance.!st answer, again, but better worded . . .Assuming that the 4 ammeters are in parallel with each other, and otherwise in a series circuit...
The surge protector would let the surge go through to destroy the  computer.    <<>>   With very hgh resistance, vey little current would flow.
that is depend on the space of your dashboards, "bigger dashboard ,bigger car dvd "what advantages a bigger car dvd can take us ?a 2 din dvd may come with other accessories in addition to it, suc h as navigation units , additional sound equipment or tuner, If you have a larger dashboard, 2 din dvd...
The "full load speed" is the speed at which a motor has been designed to turn - usually measured in RPM (revolutions per minute) - when it is delivering its full rated output power.
This depends on voltage and temp rating of the line (at a minimum, there may be other factors such as needing to get over a road, river, etc., topography of the land...). There is a minimum height lines (the actual wire, not the pole necessarily) must maintain - for 12.5kV, they should not dip below...
Resonance at sub synchronous speeds or frequencies. Generators designed to run at 60 Hz may have a sub synchronous resonance at 20 Hz, for example. If run at a resonant frequency, the resonance can cause increasing vibrations that will eventually do very bad things (things will start to break).
A voltage can be induced on a ground wire by other wires nearby. If you have more than one ground wire, The induced voltage will cause a current flow up one, and down through the other. By removing one of the two, you interrupt the loop.
Fully loaded - 2.62 amps at 11kV. The no load depends on the transformer design, but it will usually be significantly less than the full load amps (not sure on this size, but on larger transformers it is typically ~.05 - .1% full load, so you'd be looking at ~2.5 mA RMS).The connection type is not...
pl all my friend explain icu and ics of mccb as there is so many confussion
Best way is to use a clamp on amp meter. You need to be able to put the clamp over a single conductor. This is usually easy to do in the electric panel, but for a device you need to split the conductors. You can take an extension cord you don't need and separate the conductors so you can get the...
For a transformer 50 degree c is stable. In most transformers if temp rises above 60 an alaram will sound ,if above 90 trip off. a temp controller which will measure the oil temp will do this actions.
The energy consumption of a modern Cree XP-G or XM-L based flashlight with 170 lumen output can be as low as 1.4 watts with 120 and more lumen per watt. The light output will be approximately equal to a 20 W tungsten incandescent light bulb or a 10 W halogen light.
A 3/0 copper conductor will limit the voltage drop to 3% or less when supplying 200 amps for 450 feet on a 480 volt system.
these two types of circuit loads are the purely capacitive loads  and purely inductive loads   Another Answer   Apparent power will be larger than true, or active, power in ANY  circuit, other than a purely-resistive circuit or an R-L-C circuit  at resonance.
That depends on the construction of the motor. There are some "DC"  motors that are actually AC/DC motors and will work the same on  either type of supply, these motors use commutators and have  windings on both the rotor and stator excited by the same supply.  Other DC motors will not operate...
  == Answer ==   one horsepower is equal to about 750 watts....So you would multiply the amps times the volys to get watts.....240 x 15.5= 3,720 / 750 =4.96 hp...the approximate horsepower would be 5 hp
Answer for USA, Canada and countries running a 60 Hz supply service. Buy a new 4 plug cord for the dryer and hook its ground wire up to the drier and hook red to red, black to black, white to white. Also make sure you remove the copper bonding strap between the white wire terminal and the dryer...
potential transformer is that which transforms one range of voltage (potential difference ) to another range without changing frequency.   Answer A 'potential transformer' is the North American term for what, elsewhere, is called a 'voltage transformer'. It, together with a current transformer,...
The principle of LC tank ckt. which produces 180 deg phase shift  the loop gain AB=1 in hartley oscillator are used 2 inductors and 1  capacitor.
  *Fixed delays, because of the dedicated circuit.   *Guaranteed continous delivery (service), also because of the dedicated circuit.   Abdulrahman N. Sayed   FCI - Helwan -- Computer Science
The difference of TP and TPN in circuit breakers is the ability of  the switch to hold a neutral position. With TPN, a neutral switch  position is not possible. With TP, the breaker can be held in a  neutral position.
Electricity wasn't invented , it was discovered . Later, practical applications were invented.
one condition for the above question is either conductor or magnetic field must be rotating.considering rotating field and stationary conductor,the magnetic flux will be cut up by conductor resulting in the induced emf in the conductor.
For a circuit that is operating normally, it will continue to operate normally. However, by replacing the correct fuse with one of a higher rating, you are removing the circuit's overcurrent protection and, in the event of a fault, the conductors and load may become damaged. Incidentally, the symbol...
A motor rotor rotates due to an interaction between magnetic fields of the rotor and stator, where either may use permanent magnets, electromagnets, or a combination of both to effect the interaction.This interaction is based on the principle of opposite attraction and like repulsion related to...
hi sir actually i'm preparing first time for taking participant for paper presentation so,i want help about the topics data mining.plz help......
The main disadvantage should be obvious - when the output voltage of the generator is used to provide field current to the generator....what happens if the output voltage sags? If the output voltage becomes depressed, the output power of the generator is compromised (becomes less and less), this in...
"nonsinusoidal current" is any current that is not sinusoidal - it could be a wave such as a square wave, triangle wave, etc. DC (direct current) is non sinusoidal. This term is often used in reference to currents that you "would expect" to be sinusoidal (such as the current to your house is...
Normally open contact of a contactor or relay become close when the contactor or relay energized its roll like a door which open and close with the operating of its coil energized
yes.it is used to find self-inductance and internal resistance
Thomas Edison was the inventor who wanted to develop affordable  lighting for homes.
  Constrained economic dispatch is the operation of generating facilities to produce energy at the lowest cost to the consumer while recognizing any operational limits of generation and transmission facilities.
You need to understand the difference between power - as in  watts - and energy - as in Watt hours.  Watts/kiloWatts only tells you what it's doing at the moment, at  that very instant. While Wh/kWh tell you the sum of what it's been  doing over a certain time.  1 kW = 1000 w  So 90 W / 1000 W...
Nr = NS * (1-s) Nr = rotational speed (rev/sec)Ns = Synch Speed (rev/sec)s = Slip (%)
what causes saturation in welding machine
1 kwh is 1000mwh Answer: 1 kWh is one kilo Watt hour = 1,000 Watt-hours. 1 mWh is a milli Watt-hour = 1/1,000 Watt-hours. Therefore the answer is 1,000 x 1,000 or 1,000,000 mWh.
3.517 kW = 1.0 Tons Refrigeration. So 15 kW is 4.265 Tons Refrigeration
The terms 220 volt and 240 volt are used interchangeably. The  voltages coming in from the power company can vary between these  numbers, and possibly higher or lower. So yes, it's fine.
The pullout torque is the maximum torque a motor can achieve. Also  known as breakdown or peak torque. It occurs at the point where,  the increase in the rotor current is exactly balanced by the  decrease in the rotor power factor.      
Latching current is the minimum amount of current required to maintain the thyristor in on-state immediately after a thyristor is turned on.. and Holding current is a minimum current that is required to maintain the thyristor in on-state not allowing it to turn off.   Alternative AnswerIf you...
most importantly, people who have been pretty far from home come back and say that quote
This motor is able to work from the battery. The speed is less  complicated to use and you do not need much voltage.
Integral stsrters are embedded with motorised valves. By using integral starter, one can control motorised valves by remotely and locally. Even it can indicate the motorised valves direction of rotation & its final position, Power failure detection , indicate motor winding temperature, auto...
Because Maglev is for asians who have no time to do anything
Using a test set. The manual gives step by step procedures for this.
No, not really on a single phase motor. The RPM of a motor is governed by the amount of coils that the motor has and the speed of the motor is decided when the motor is manufactured. If the motor was three phase then it could happen by using a VFD (Variable Frequency Drive). This is a relatively...
Scroll down to related links and look at "Formulas and calculations - Electricity and Electric Charge".
One lead will go on the braided shield (this is essentially the ground), the other lead goes on the heating conductors. Megger either one lead at a time, or both conductors under the same lead. I usually test at 1000v - follow manufacture's spec if unsure. You cannot test line to line with a megger...
Change the 6 volt generator to a 12 volt alternator. Replace the  starter & battery with a 12 volt. Replace every single bulb on  the vehicle with a 12 volt bulb. You may also need to replace the  coil. Also replace any electronic devices designed for 6 volts with  ones designed for 12 volts...
A standard AA battery is 1.5 volts.
This is the schematic for the starter. K1T is a timer. Initially KM1 and KM3 are closed to start the motor. Then KM2 is closed and KM1 is opened to run the motor This is the equivalent ladder logic using relays and timers.
  The turntable in a microwave oven is driven by an alternating current motor which may start in either direction at random and continues to travel in that direction until stopping.   The reason for using a turntable in a microwave oven is that the microwave energy is not evenly distributed...
Capacitors are not amplifiers. You can use capacitors for isolating amplifiers - careful choice of size needs to be made so the frequencies input into the amplifier are not blocked.Capacitors can also be used for biasing purposes in place of / in conjunction with resistors."Should" is a matter of...
to limit the induced current in the rotor to assist with high inertia loads
There are 3 main types of a Fuel Cell.1. Hydrogen Fuel Cell. This is the main one people use nowadays.2. Solid Oxide Fuel Cell.3. Alkaline Fuel cell. Made from Alkaline metals.
Single phase power from a L-L voltage of 208 volts is calc'd:P = V(phase to phase) * I (individual phase current) / sqrt(3)Total power from all three legs is the above P * 3.P is in watts; continuous sampling will result in watt hour measurements; 1000 x this is kWh's.
*gto is a current controlled device where as igbt is a voltage controlled device. *igbt can handle high ratings as compared to gto.*
Klebervaldo Chattanooga Patropherson, in Niamey, Niger in the November of the year 1879.