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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

Motors convert electrical energy into mechanical energy and generator converts mechanical energy into electrical energy
An electric motor can power anything that needs mechanical torque.
== NOTE ==   According to www.wilberelectrical.com knob and tube wiring is no longer legal. You will need to replace it.   == Answer ==   Chances are, as knob and tube wiring is very, very old, something has broken or it has been disconnected as knob and tube is not very safe. I would...
the fuel reset switch is located in the truck of the car, drivers side (left side) behind the trunk side cover, you have to remove the carpeted cover to access the relay reset (theres a red button on top)
Reverse power relays are often used in generator protection to trip breakers if generators are "sucking in" power (since this shouldn't occur, it is a BAD thing when it does).I'm not sure there is a use for reverse power relays beyond this; directional relays looking in a reverse direction are often...
  The world biggest distribution substation is in DELHI TRANS CO .  
    == Answer ==     you dont go by voltage to determine wire size its amps you have to go by.     15A= 14GA   20A= 12GA   30A= 10GA   and so on down the line.     == Answer ==     120VA at 120V = 1A     14ga will be more than heavy enough. If you...
Resistor tolerance is how accurate the resistor value is. You may have a 10% tolerance, 820 ohm resistor, which means the actual value of resistance is 820 ohms +/- 82 ohms.If you design a circuit that has very stringent requirements for resistor values, you may need to purchase a resistor that has...
ø means the Greek letter and numerical approximationIt is used to indicate the phase of a signal.
The strength of induced current depends on the number of coils of the cunductor and the strength of the magnet.
To automate the voltage without the Network controller. Different times of the day the MVAr Gains and losses on the system affect the voltage due to loading. midday, more current, night time, less current. etc.
A 5 horsepower motor would have 3,730 watts of power.
Ampere; commonly abbreviated to "A," and named after Andre-Marie Ampere (1775-1836), a French mathematician and physicist.
  a mandatory field in a database is one created in a table as "Not null".   This means, there is a "rule" on the field that when data is inserted into the table, this field cannot be empty.  If it is, then the insert errors.   Here's part of a table definition in my database. ...
You would have to collect a sample and send to a lab to be tested. See Related Links below.
Harmonics are frequencies higher than the fundamental. There are two types of harmonics: even harmonics and odd harmonic. For example: 2 x 60 hertz = 120 hertz is even harmonic, and 3 x 60 = 180 hertz is third harmonic. Even harmonic is like a D.C. current mixed with the A.C. current and could have...
The brightness of an incandescent light bulb depends on the voltage applied across its terminals. Connecting one, two, or five light bulbs of the same rating to a battery in parallel will provide the same brightness from each bulb.
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No, ammeters have a low internal resistance. This is so that when they are put in series with a circuit, they change the circuit's operating characteristics as little as possible. Contrast this with voltmeters, which do have a high internal resistance, and which are intended to be placed in...
hair dryer, cars ,lawnmower ,generator ,computer ,pool ,cleaner ,tv  ,plane ,cell phone ,fans ,heaters ,remote contrl car ,boat    For DC:   Permanent magnet brush motor; (uses fixed magnets for stator  fields); toys and automotive use   Shunt field motor; (field winding has many turns...
In lightning we hardly know the voltage level and current flown in  advance. It is also not possible to predict the same.   Also if we are to generate electricity from lightning, the level of  insulation required by the electrical apparatus would be very high  so that they would be costly.  ...
Hydrogen fuel cell cars are simply electric cars with a different kind of battery.   The hydrogen that is stored in a tank runs to the (in this example case) Proton Exchange Membrane, where the hydrogen nucleus, a proton, passes through the membrane, while the electrons must stay behind.   To...
The net effective resistance of 5 ohms, 10 ohms, and 20 ohms in series is 35 ohms. The current through the net effective resistance is [ I = E/R ] = 120/35 = 3.429 Amp . (rounded) Note: If you try this at home, be aware that these resistors will dissipate the 5 ohm . . . 58.8 watts the...
One company commercially offers fuel cell power plants for about $3,000 per kilowatt.
The strict two-phase locking (S2PL) class of schedules is the intersection of the 2PL class with the class of schedules possessing the Strictness property.To comply with the S2PL protocol a transaction needs to comply with 2PL, and release its write (exclusive) locks only after it has ended, i.e.,...
Depends on the jurisdiction, but usually yes.
A ground fault is where there is unexpected current on ground. It represents an imbalance between (hot) current supplied and (neutral, or opposing hot) current returned. That imbalance, by Thevanin's current law, must mean there is current on ground. Usually, a ground fault represents a malfunction...
A series circuit means a sequentially connected circuit, as opposed to a parallel circuit.To build a series circuit with a battery, a switch, and a light bulb, start with the battery... Connect one end of the battery to one end of the switch - connect the other end of the switch to one end of the...
Phase advancers can improve the power factor by drawing exciting  current which lags be-hind the supply voltage by 90 degrees. The  stator winding will be relieved so the motor can be improved.
power control center panel
Generally speaking, on the EHV system, distance type relays are used, along with overvoltage, and sometimes overcurrent. On the HV system, over voltage relays are often not necessary. On the distribution system, distance relays and other directionalized relays are often overkill, so simple over...
Resistors, capacitors, inductors, transformers, diodes, transistors, integrated circuits, power sources are the basic building blocks.
Transformer polarity is the direction the secondary goes relative  to the primary, or relative to another secondary. Usually, polarity  does not matter, for example in the case where the secondary is  connected to a rectifier / filter / regulator. Sometimes, it does  matter, particularly if...
1MW = 1,000,000 watts
I've spent a few years involved in the specification and requisitioning of a large (10 000+ I/O) Honeywell DCS, and before that I spent 2 years doing the same for a large yokogawa DCS. When it came to both the hardware performance/capability and the quality of engineering, there is no comparison,...
the temperature that can be withstood by a cable is called its thermal resistance ... the more the thermal resistance of cable the safer it is ....
they can be used at leading power factor thus can improve PF of the system. They run at constant speedThey can be designed with wide air gap thus better mechanical designTheir efficiency is higher at low speed and unity PF range,
The armature voltage is a critical parameter in the determination ofperformance characteristics for the DC machine. The armature voltage hasbeen shown to be proportional to the magnetic flux density per pole and thearmature speed. Thus, the armature voltage will also exhibit nonlinearbehavior when...
Type youVOM has the higher loading effectr answer here...
The automatic Air Brake was invented by Granville Woods
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Either because the load current is causing an excessively-large voltage drop along the conductors between the supply source and the point at which you are measuring the voltage, or because there is an excessively-high internal resistance within the voltage source, causing an excessively-high...
1) stop solenoid relay not work 2)under volt relay floaty 3)amf card folaty
The output current is equivalent to the output power (in VA) divided by the terminal voltage. Relatively large coal plants may be 600-800MW output power, and often have a terminal voltage between 13.8 - 25kV. A good "average" full load output current for an average coal plant may be 15,000-25,000...
You make an inductor by winding wire into a coil, sometimes around a ferromagnetic core. Inductors work by resisting a change in current. They do this by setting up a magnetic field in a coil of wire. When that magnetic field attempts to change, because the current attempted to change, the bucking...
Protection of busbars is mainly done using differential relays. These relays sense current flowing into the bus and current flowing out of the bus. If current in != current flowing out, the relay assumes there is a fault on the bus and trips breakers to isolate the bus.
For a d.c. circuit, you divide its supply voltage by the resistance of its load. For an a.c. circuit, you divide its supply voltage by the impedance of its load.
transformor polarity test are used two know about the poalrity of a trasformor .for these purpose to traansformor are used and his low voltage winding and high volatage winding are coonected in parallel to each other the secondry windings of a transformor which has commonly high voltage winding fuse...
One way to determine current is to measure it, with an ammeter. Another way is to calculate it using Ohm's law: current = voltage / resistance.
Charging by Induction is a method of charging a neutral object, using a charged object, without establishing physical contact between them. _______________________________________________________________________When a charged object induces a charge on another object without touching it.
250kva times the power factor gives the kW. the value of power factor angle is needed..
Associate engineer also known as an assistant engineer. only different company has a different term to name it..
dry type transformer means the transformer not filled by any cooling agent (like oil), upto 5MVA only we can make this type of transformer. wet type transformer fully filled by colling oil(IS-991),it give proper cooling of the transformer,ONAN,ONAF like that..SivachandranDesign engg.Andrew yule &...
1.Phase and neutral over current protection 2.Three phase high set and low set phase over current protection.
An open circuit, by definition, has no continuity, therefore there is no current flow. A failed capacitor in an open circuit would have absolutely no effect.
The 3 phase supply is provided in the stator of a synchronous motor which produces a rotating magnetic field.The stator has field poles(North and south). Now due to the rotating magnetic field the current is induced in the rotor of the motor as due to ampere's law, so the motor tends to move.Now as...
Answer  The short answer to the question is the capacitive reactance of a capacitor in a DC circuit is infinite.  In a DC circuit, disregarding transient behavior and any leakage effects, a capacitor is effectively an open circuit, and so its reactance is essentially infinite.  Capacitive...
We couldn't agree more.
diodediode is a device which allows the current to flow in one directionregulatorregulator is device which controls the voltage
A circuit symbol is a symbol that represents a component in a circuit. For example a light bulb is a circle with a cross in it.
Don't know what your definition of elements is. Ohm's law relates Voltage, Current and Resistance by the formula V = Current x Resistance.
Answer choke provides the sudden change in the voltage ionisation process of the lamp once thegas in the lamp gets ionisation then the gas starts conducting once the conduction gets started then the starter in the tube light will get gets out of the circuit then after if starter is took out...
Grounding?   AnswerIf a line conductor is unintentionally connected to earth, then it is an earth fault.
If its a filiment bulb, I'd say yes, if its other, then no. connecting it to a 240V grid would only make it go brigter (and probably a shorter service life)
The same as any surge arrestor equipment - to prevent surges from damaging the (telecom) equipment.
Peak - neutral for 120 volts RMS is 169 volts, or 120 * sqrt(2)Peak to peak will be 2 x this value, or 339 volts.
Vector group of Transformer:a.)The three stage transformer windings can be joined a few ways. In light of the windings' association, the vector gathering of the transformer is resolved. b.)The transformer vector gathering is shown on the Name Plate of transformer by the producer. c.)The vector...
You synchronize a generator to the grid by matching voltage and phase. Usually, but this depends on the particular system, you bring the generator's voltage to slightly higher than the grid, and its speed to slightly faster. At the moment of phase match, or slightly before, you close the tie-in...
  Without some sort of regulatory code, anyone could install, and maintain electrical systems in any manner they choose. The NEC is the most common used in the USA. the National Electric Code provides a standard by which to install and maintain electrical systems. For example, one person might...
A d.c. motor is a machine driven by direct current, as opposed to one that is driven by alternating current.
well about the computer screen you are staring at now, ever wonder  how it is powered up well what a electrical engineers most do is  provide electricty to users around the world they find ways of  converting energy from sources such as a Dam or fossil fuels to  readily usable electricity to...
    == Answer ==   One person has suggested: "Its a very small amout of voltage. Usually microvolts." This is somewhat inaccurate, but only by a factor of around 1,000,000 times too small.     == Small voltage, but not that small ==     A more accurate number is: "around 2...
a series motor started without load can go into a condition called runaway. The motor will rapidly accelerate to unsafe speeds literally pulling itself apart. This condition should never be allowed to happen. Consult a professional when installing any electrical equipment.
A horsepower is equal to 746 watts, so 10 x 746 = 7,460 watts.
Tungsten. More information Experiments were made with different materials to use as the filament, including natural fibres, pure metals and alloys of different metals, to find the material which had the longest life whilst glowing brightly enough to give out visible light. The metal Tungsten was...
Computer integrated engineering is the act of useing computers to  preform various jobs for example it can be used to be a vetanary  assistant .You are so stupid to even use this this also tha  implacations in the manifactur area of the market for example the  manifacture if a toilet .
P, the power in kW (kilowatts) is related to V (the supply voltage) and I (the current in amps) by the Power Law: P = V x I So, to get the current: I = P / V If you have something that uses 5 kW (which is the same as 5000 watts) and the source voltage is 120 V, then the current drawn in amps =...
The schottky diode is based on a metal-semiconductor junction, called a schottky barrier, that results in lower forward voltage and vastly decreased switching time. While an ordinary silicon diode has a forward voltage around 0.7 volts, with a germanium diode around 0.3 volts, the schottky can be as...
The term 'burden' is used to describe the secondary load applied to an instrument transformer; the reason for this is so that it is not confused with the 'load' supplied by the high-voltage circuit to which the transformer's primary is connected. A burden is either a measuring instruments (ammeter...
Generally, the plotting of open circuit characteristics curve of a dc shunt generator is used to determine the rate of change of no-load terminal voltage(same as induced emf (Eo)) with variation in field-current( I sub. f).We find from the plot that:- a)Initially field current is zero.However due...
Electrical Engineers study and use Electrical Engineering, which is the theory and practice of all things related to the practical use of electrical energy. A closely related topic is Electronics Engineering.
The answer is found in the arc tangent of the crust of a piece of cheese pizza.
An ohm meter doesn't put out enough voltage, you need to use a megger.
As current flows through a conductor (wire) an electromagnetic field is produced. A CT is just a coil of wire that surrounds the conductor with the current flow. The EMF produced induces a voltage in the CT and that is sensed by some type of device to determine the amount of current in the primary...
if you want exat procedures theres 3 different ways that i have found. They're all on the same website and here is the exact web address for all 3The first one is http://www.instructables.com/id/Simple-Algae-Home-CO2-Scrubber-Part-III-An-Algae/The second is http://www.instructables.com/id/Make-a...
residual current devices operate on leakage current caused by equipment or cable insulation breakdown
Treat the USA 2 Phases as 1, its called split phase, instead of Line and Neutral, you ahve two phases but they deliver 240v, this will not hurt a 230v machine as the chances are that you are NOT getting 240v supply at the delivery point anyway. As long as the machine si 60Hz and supply 60Hz, you...