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Electrical Engineering

~33500 answered questions
Parent Category: Engineering
Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.

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There are two types of communications. connection oriented where there is direct line of communication between the sender and the receiver like a telephone n/w. The other is the connectionless communication. This is how most of the internet is arranged. The sender sends the packet to the destination…
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Havoc havoc means devistation do you dev-as-tation? devastationThe word havoc is a noun and means destruction, confusion, and disorder. This word originated in the 15th century.
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You need wire, a nail, and some steel sheet cut from a can. Then you need a bell. Wind the wire round the nail to make an electromagnet. Nail the strip of steel to a wooden block. Fix the electromagnet so that it pulls the steel when switched on. Then you need to make a switch which will be another…
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High frequency spark generators are essential mechanical devices that are used in cars to start the ignition. This device is usually powered by batteries.
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Phase shifting transformer is like a auto transformer, but has complex turns ratio. Hence along with changing voltage levels, it changes the angle of voltage.
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The electromagnetic crane has a huge electric magnet that is operated by an electrical current. When the electricity is switched on the magnet becomes magnetized for allowing metal objects to be picked up just like an ordinary magnet, but when electricity is turned off the metal object fall away.
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Yes, cash flow can be positive while net income is negative.
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Answer Please re-phrase the question for clarity. A good how to book can be found at your local book store. What one will be best can be determined best by you. Some people love technical type manuals others like a comentary type story or Q and A. If you know your reading style, it wil…
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parallel connection increases the current at constant voltage at the supply end & decreases the current flowing across the load. AnswerAny load will only operate at its rated power when subjected to its rated voltage.As each branch of a parallel circuit is subject to a common voltage, this ena…
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It depends. In the organisation I work with, we use about 30%. It could be between 20 - 50%.
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Answer Mazda protege cross jumpDepends on how lucky you are. May have done nothing, may have blown a fuse, may have blown a fusible link, may have fried the alternator, may have upset the computer. All or none of the above.
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a resistor can be used to reduce current flow
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An integrated circuit - or IC - chip is a circuit made with components such as transistors, diodes and resistors that are usually formed simultaneously on a small chip of silicon. ...... Two or more transistors (and they're up to many millions now) AND some (or all) of their interconnections on …
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A small, three car maglev train weighs more or less 100 tons, so they are relatively light trains.
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In a three phase system, power P = U * I * sqrt(3) * cos(phi), where U is the voltage (rms), I the amperage (rms), sqrt(3) is the square root of three, and cos(phi) is cosine of phi, where phi is the angle between U and I. For pure resistive load, phi is zero (i.e. cos(phi) = 1), making the calcula…
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Nikola Tesla invented a generator that produced alternating current (ac).
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A half-wave rectifier converts an alternating voltage (such as your wall socket) into a pulsing DC signal. This can be further processed with circuits called 'filters' and 'regulators' to produce a steady DC voltage (such as a battery.) The basic half-wave rectifier is a 'diode'. This is an electr…
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In the US most residential an a fair amount of commercial lighting is done with 110 volt 15 or 20 amp Alternating Current (AC) curcits.A large amount of office lighting is done with 277 volt 15 amp ac curcits. Some is done with 240 volt ac and some with 480 volt ac, but these ar usually in industria…
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Core loss is also called "No-Load" loss. To measure the core lose simply you need variable AC supply, Wattmeters, Ampere meters and Voltmeters. The basic principle to perform this measurement is to supply the transformer with its nominal voltage and then record the Watt or Kilo watt values. You will…
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DC Generator Series Gen-Rising voltage characteristics-used as booster in feeders Shunt Gen- Constant voltage- Battery charging,ordinary lighting Compound- Differential-Drooping characteristics-Welding power supply Flat compound-constant voltage-ordinary lighting overcompound-voltage increases as …
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Yes. Depending on who does the work it could be less expensive than getting a different air conditioner. The compressor will also need a capacitor and some rewiring. The old unit could have a 3 phase blower motor also which could run the price up even more. Although the changes can be made, the w…
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Answer Should be only 4 to 6 screws holding the molding in place accessable from the bottom side. Or just locate the Hzd relay or Hzd Light Fuse and pull it. Relay may be in the power distribution ceneter under the hood drives side (black box).
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The purpose of the fuse is to protect the equipment receiving power from overload or short circuit. Having no fuse could result in destroying the equipment and/or a fire. In buildings the fuse protection (or circuit breakers) also protects the building wiring. <><><> While it is …
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Answer The best way to answer this question might be to consider the consequences if the input impedance was low: with a low input impedance, (signifficant) current would start flowing, and the amplifier would draw energy from the signal sources. None of the typical signal sources is designed to …
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Milller's Theorem is used to simplify a circuit for circuit analysis. Instead of one impedance, which connectes two non-grounded nodes, Miller's Theorem allows this impedance to be broken down into two parallel impedances. One impedance can be seen as Z/(1-A) and the other impedance can be simplifie…
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A resistance standard is an extremely precise accurate resistor. They are typically used for calibration or laboratory purposes. They are commerically available from 100 microohms (0.0001 ohms) - 100 Terraohm (100,000,000,000,000 ohms) and are typically stable to 1-100 ppm per year for single value …
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Reaction to Reactive power is a strange subject, even for utility reps. There is a brochure available from most power companies explaining reactive power. There are a couple of short explainations I do not like, so I will not repeat them. It helps to have a diagram like they use in the brochure o…
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One definition One view point is that "Electrical" relates to the development and delivery of the electrical energy to the various devices that perform specific functions in a given environment. Example: The alternator in your car that series of wires delivers electrical power / energy to various co…
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We often see electronics engineering as a subset of electrical engineering. The "old school" way to separate the two was was often to say that electrical engineering was "high current" engineering and electronics engineering was "low current" engineering. The primary differences today usually involv…
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first you need to measure the surface area of your rad. then got to your local parts place and tell them you need an aftermartet electric fan kit (with your predetermined fan size and the kit will have detailed instructions for installation
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The temperature coefficient of resistance is a number used to predict how the resistance of a material changes with changes in temperature. Typically the units are either resistance per temperature or 1/temperature depending on which equation is used for the calculations. For example, in copper the …
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Impedence is synonymous with resistense. Greater the I, lesser the output No. First, it's *resistance* and *impedance*. Now, if the amplifier is a current amplifier, the above makes sense. (higher Zin, less Iin for a constant Vin). But if it's a purely voltage amplifier, it only responds to …
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As per API 6A temperature classification, -20 deg F to 250 deg F operating temperature range.
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The colour phasing of a three phase electrical bus differ in different countries. In Canada the colour coding is A = Red, B = Black, C = Blue.
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You can imagine this senario as so: Let's say you have a tank of pressurized water connected to a hose that you are using to water the garden. What happens if you increase the pressure in the tank? You probably can guess that this makes more water come out of the hose. The same is true of an electr…
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SOME ONLY HAVE 2 WIRES SOME HAVE THREE.. THE 2 WIRE IS GRAVY .. THE 3 WIRE THE ONE I THINK YOU HAVE IS EASY TOO THE TWO YELLOW GO TO ONE POST THE RED OR WHITE WIR GO ON THE OTHER POST
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You charge a capacitor by placing DC voltage across its terminal leads. Make sure when using a polarized capacitor to place positive voltage across the positive lead (the longer lead) and negative voltage across the negative lead.Also make sure that the voltage you charge the capacitor to doesn't ex…
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Hi: You got a bonifide good question on your hands there. No kiddin, And , A good question deserves a good answer. This, Is something I'm going to attempt to do for you. 1,,, lets for a moment, ( assume ) that the Coleman generator that you call a ProForce 2500 is in fact a 2500 watt rated gene…
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Answer I believe you are referring to a piece of test equipment also known as a "function generator." It generates a voltage equal to some function of time. The most basic models will produce sine, square, and sawtooth waves at different frequencies, but the more expensive models will do all kind…
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If you are talking of house electric there would be No lights without Oil lamps, No hot baths without boiling water, No heat without fires, No air conditioning at all, ETC.... No heaters or electric heat, no forced air blowers for gas or oil furnaces or other forms of heating homes, street lights, …
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there can be a lot of leakage flux in auto transformer. because primary and secondary winding in auto transformer is not separated. _______________________________________________________ There is no primary to secondary isolation. Current rating is limited to the size of the conductor used for the…
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Phones work because electricity goes through phone lines and the electricity from the phone lines send energy to every phone in te country.
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voltage: it is the potentail difference between two wires. or it is the amount of energy used to force the electrons. current: it is the flow of free electrons.by Balaji,NITC  AnswerThere is no such expression as 'potential voltage'. 'Voltage' is simply another word for 'potential difference'.
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Voltage drops Whenever current passes through a resistance of some kind, a voltage drop occurs across that resistance. The amount of the drop is given by Ohm's Law: V=IR Where: V = The value of the voltage drop I = The current through the circuit in amperes R = The total resistance of the circui…
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The 2N5777 is a Darlington silicon NPN photo detector, or, if you prefer a photoDarlington. A link is provided to a bit of data on this device.
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Circuit Resistance Calculations Is the circuit in series or parallel? If series then R = R1 + R2 + R3 (where R = Resistance) Or R = 20+20+10 = 50 = 50 Ohms If parallel then I/R = I/R1 + I/R2 + I/R3 (where I = Volts and R = Resistance) Or 5 ohms
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Resistivity allows us to compare different conductors' abilities to transmit electric current that is independent of the physical dimensions of the conductors. Resistivity is defined as 'the resistance of a unit length of a substance with a uniform cross-section'. In SI, the unit of measurement of …
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A relay will have a control circuit and a function circuitcould be the same feed line.One set of terminals (Hot and Load) can be activated at all times, but will not function until the control circuit is closed.The control circuit has a Hot and a Ground--when activated either by supply hot or ground…
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Answer Lubrication and to repel moisture Good for door seals--prevent them from freezing and keeps them pliable
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The technological benefits of electricity are just about endless. Without it, there would be no street and home lighting, computer technology, hospitals, cars, home appliances, and a myriad of other things. Electricity is the most neat and clean form of energy. It is environmentally friendly. It…
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Answer E=voltage at no current, 12.6V V=voltage at 4amperes, 12.2V I=Ampere, 4A V V= E-Ir r=(E-V)/I r=(12.6-12.2)/4 r=0.1 ohm
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We generally credit Nikola Tesla, the Serbian-American inventor, with the pioneering work of identifying the rotating magnetic induction field idea and applying it to a device that generated torque - rotational energy or force. His work on this occurred in about 1882.
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In nonmetals such as diamond, thermal conductivity is created by lattice vibrations or atomic vibrations of the crystal to transfer energy . The atoms and bonds can be viewed as balls and springs connected together in a chain. When one end is heated, it starts to vibrate causing the next ball and sp…
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Dielectrics Dielectrics is a fancy term for insulators, based on the material used and its efficiancy at a measured range of frequencies. For example, in a coaxial cable, the better it isolates the main frequency from feeding through to the shield, the higher the dielectric value.
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A capacitor in its simplest form is merely two electrically conductive plates separated by an insulator from each other. As such the capacitor will block any DC voltage from passing through it, up to the electrical dielectric strength of the insulator. The capacitor will accept a DC charge and an el…
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It depends what type of engineer you are. If you are a mechanical engineer and if u have experience u make around $80,000-100,000 per year.Eletrical engineers make about the same with experience. Civial engineers with experience and what type of mission their doing ,like if their making a okay sized…
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There is no "slam dunk" answer for calculating the derating of a motor operated beyond its manufacturer's rated temperature. There is a very good reason for this. The "curve" of a motor's performance with regard to temperature isn't linear. In fact, it's far from it. And it will vary a great deal de…
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Quite well. But what kind of amp? In general, the amp takes a "line level" signal (left and right channel) and puts it through a series of amplifiers to make the signal bigger (amplify it). This is an increase in what is called the "gain" of a given stage or of a series of stages. Small signals driv…
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Just as there are car engine and gearbox re-build workshops, there are specialist firms who have the necessary expertise and equipment to do motor rewinds. You could ask them if they can do an economical rewind on your motor or they may be willing to offer you a trade-in deal for it against a new or…
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Answer A BJT is one type of transistor and POWER TRANSISTOR can be BJT or MOSFET or some other phenomena.POWER TRANSISTOR are usually those who are used at high current ratings e.g at POWER AMPLIFIER where large transistors are used at final stage to gain output.
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Yes. Let's look at an example. A 12 volt system can operate a 12 volt relay coil to actuate the plunger. But when the field of the coil collapses in the instant following when the coil is de-energized, the collapsing field can generate an "inductive kick" that can easily reach several hundred volts.…
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In a series generator, as load is added, output voltage increases.
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QDrive is the only company I know which manufactures commercial linear alternators. Visit www.qdrive.com for details. They manufacture linear alternators upto 10 kW. But I guess they are very heavy!The Umbra Group (www.umbragroup.it) also manufactures linear alternators from 700 Watts to +50 kW. The…
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Answer Transistors are semiconductor devices which can be used as switches (to turn on and off an electrical signal or current path) and also as a signal amplifier in a circuit. There are two broad types of transistors BJT (Bipolar Junction Transistor) and FET (Field Effect Transistors). - Neeraj…
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Mechanical engineers research, develop, design, manufacture, and test tools, engines, machines, and other mechanical devices. Mechanical engineers work in many industries, and their work varies by industry and function. Some specialize in energy systems; applied mechanics; automotive design; manufac…
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Answer Take all phases into account. Voltage is measured between two phases of the three phases at one time, so what this means is this...first you read voltage between line 1 and line 2...then you read voltage between line 2 and line 3...and then from line 1 to line 3. Each phase of a 3 phase syste…
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A circuit breaker is used to ensure that the circuit doesn't get overloaded with too much wattage or voltage, which can cause a fire.
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NOTE If you have silver colored wire in the wall, it is aluminum. Unless you know exactly what you are doing, call an electrician. Aluminum will react with copper and wiring devices made for copper, so special hardware is required. Aluminum has problems with heating at bad connections, and has…
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Life can be improved: We can do more work in less time e.g. washing clothes, ironing clothes, oven, microwave, sewing machine etc. Communication is easier using telephone, computer, fax machine, printer, etc. Life is possible in places with extreme weather conditions. Better hygienic condition…
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Answer there would be no problem with this Answer The inductive circuit has a 'lagging' power factor. If you over-compensate with too much capacitive reactance, you could go over the top (past 1.0) , and end up with a leading power factor that may even be numerically worse than when you s…
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Inductances add in series, so the formula is simply L=L1+L2.Inductance is handled in the same manner as resistance in serial and parallel circuits.
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A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. Commonly, transformers are used to increase or decrease the voltages of alternating current in electric power applications.
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What kind of DC Motor? Different motors have different torque DC Motor Types Permanent Magnet: No field coils at all. Series Wound: the field coils are connected in series with the armature coil. Powerful and efficient at high speed, series wound motors generate the most torque for a given curr…
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Large load impedance will draw a small load current and so loading of the source is small. (light load). A small load impedance will draw a large load current from the source. (heavy load).
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A clockwise motor runs clockwise because of the way it is made. It is designed to run clockwise because the designer has an application that calls for clockwise rotation. A counter-clockwise motor runs the other way, again because of the way it is made. Many electric motors are reversible. If yo…
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The real power in a DC system is the product of voltage & current. P = V * I In an AC system the power is equal to V * I * power factor. The power factor allows for the fact that the power is less than the volt-amps. This happens when the voltage and current are out of phase, i.e. if they reach…
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Almost all of the equipment inside of a substation is used for the purpose of protection. The circuit breakers and power transformers in the substation are equipped with current transformers (CTs) that step down the current passing through the equipment to a level that can be read by protective rela…
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Bipolar transistor current gain is also called "Beta," or the h-parameter "hfe." beta = current_out / current_in The beta of a BJT is mostly determined by the thickness of the Base region, and by the excess doping in the Emitter relative to the Base. A thin Base and a heavily-doped Emitter leads t…
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Electromagnetic Induction mainly deals with the ways that energy is shifted about between Electric and Magnetic fields in various circumstances. Here are some major examples: 1. A moving Electric Current Induces a Magnetic field: Electromagnets. 2. A moving conductor in a magnetic field Induces an …
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For USA, Canada and countries running a 60 Hertz supply service. The ground or "earth" wire is a circuit's safety protective wire that normally carries no current. It is there to force a fuse to blow or a circuit breaker or GFCI to trip if a fault condition occurs in any appliances, their flexible …
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Underground cables are 'armoured' in order to protect them against mechanical damage. This armour takes either of two forms: (1) steel tape, or (2) wire. Wire armour tends to be used on cables with a larger diameter, as it makes them more flexible compared to cables with tape armour. In both cases,…
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The principle for an auto blood analyzer is to count blood cells and biochemical properties in the blood. An automated blood analyzer is a machine that does its function automatically.
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A circuit branching off a main circuit that is directly connected to the breaker box.
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Because the series resonant circuit has the lowest possible impedance at resonance frequency, thus allowing the AC current to circulate through it. At resonance frequency, XC=XL and XL-XC = 0. Therefore, the only electrical characteristic left in the circuit to oppose current is the internal r…
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To apply the AC magnetic field to the rotor, making it rotate.
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servo motors change their rpm as instructed servo motors recieve instructions from a controller to do some action servo motors generally have feedback so the controller can see where they need to go servo motors can be electric air or hydrolic powered an example: cars have a cruse control …
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A sonar transducer is the element in the sonar apparatus that turns the electrical signal into sound, which is mechanical energy, and then does the opposite for returning signals. A generator of some kind creates and amplifies the electrical signal, it is directed to the transducer, which then makes…
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Power factor is truepower divide by apparent power.
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There are two conductors were electricity begins and runs through wires which make energy come out of a battery.<<>>In the center of each cell there is a rod called a cathode. It is usually composed of graphite. Surrounding this cathode there is an electrolytic substance which acts as a …
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the current is raped from it's present to some a new value . Expanding or collapsing magnetic field units a cross coil and induces a voltage that opposite di/dt
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1. Electricity can cause pollution if it is generated by fossil fuels, or nuclear energy. It can affect animal life if it is generated by hydroelectric dams or tidal power. 2. Electric devices, circuits, conduits, and transmission lines present a shock hazard to people: those who use it, those who …
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Let's start with understanding viscosity. Your owner's manual may tell you to use SAE 5W-30 engine oil. What does this mean? SAE stands for the Society of Automotive Engineers. They have created a standard for identifying the viscosity characteristics of engine oil. The 5W-30 part of the symbol is a…
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Because as the signal voltage increases on the base, the base current increases this causes the collector current to increase, this decreases the voltage drop Vc to ground. As the base voltage decreases the base current decreases causing the Collector current to decrease, increasing the voltage drop…
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Relays rated for AC/DC use: the DC rating being lower than the AC, This is because DC can establish an arc across the contacts which cause the contacts to burn more,so they are rated lower.When I use relays on DC I will use double pole relays an put the contacts in series this gives a wider gap whe…
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This is done in order to minimize power losses in the power distribution network due to the resistance of the transmitting cables. It should be noted that for a given cable resistance, voltage drop, and thus power dissipated in the cable and not available to use, is directly related to the current f…
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