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Electrical Engineering

~32100 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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Friction and windage causes mechanical loss in DC machines.
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Palo Verde Nuclear Generating Station is the largest power station in the United States.
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For the common small cables used in domestic electricity the maximum current for a short time is 10 amps per mm2, reducing to 8 A/mm2 for loads that are on for 1½ hours per day, to 4 A/mm2 for loads that are on for 6 hours/day, and to 2 A/mm2 for continuous loads. Currents higher than the above wil…
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A good laboratory to test out high voltage experiment should be a government owned laboratory, or one that is government approved.
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Synchronous motors are only really needed when the speed must be maintained at a precisely constant RPM. A synchronous motor operates at precisely synchronous speed as determined by RPM=120f/p.
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You'll need to decide *which* one you want. An impedance-matching transformer has a defined primary-to-secondary turns ratio. This *may* give the level match that you want, it may not. Alternately, you can design for a level match, which also *may* give the impedance ratio you want, it may not. I…
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AC servomotors require an alternating current as a power source, meaning they need to be plugged into an outlet, while DC servomotors require a direct current as a power source, meaning they can be run off of battery power.
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The stator and rortor are what causes the core losses.
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The same as the time constant of a 2.7 microfarad capacitor and a 33 ohm resistor connected in series.
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Depends on the charger, and what the battery can take. Can be anything from less than one hour to the better part of a day.
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The word "developed" is slightly odd in this context. If the power supply provides a current to some instrument or device, the power supplied is the voltage multiplied by the current. The power supply will also consume some power itself to do this job. The total power consumed (provided to the power…
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In inductive circuits the current phase lags behind the voltage phase. The phase difference between current and voltage can mean you can get heavy currents flowing that aren't doing useful work, yet contribute to wasted power if they flow in other parts of the circuit (or even in surrounding metal s…
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for the purely inductance power,the power factor is zero because true power equals zero.here the power triangle would look like a vertical,because the adjacent (true power) side would have zero length....Engr. olunloyo university of lagos ,Nigeria
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In an industrial automation system, PLC is a very common system. PLC holds the software program and some hardware. In simpler way - PLC has a processor and Input and output cards. Input cards receive signal from field devices. Output cards send out the control signals to filed devices. The flow …
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By doing open circuit test of a single phase transformer we will get the no load loss or full load iron loss and by short circuit test of that transformer we will get the full load copper loss and adding this two losses we will get the total full load loss and thus we can calculate the efficiency an…
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Resistance decreases, not increases, as you apply pressure to probes.
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Depending on what circuit breaker is purchased, depends on what amp the built in circuit break is.
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Shunt resistors are used with ammeters; voltmeters require series resistors.
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Electrical, bi-electrical and homo-electrical.There is also dyno-saur-electrical which you should ask your mum or dad.
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It is a step up or step down for power delivery.
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A half horsepower motor draws between 2.3 & 3.2 amps at 220 Volts depending on the efficiency.
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'Good' grounding, or earthing, has no effect whatsoever on electricity bills. Electricity bills are based on your property's energy consumption. Grounding is simply a safety feature of the electrical system; it draws no energy.
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Where are you typing it? In a MS Word document go to "Insert" on the menu bar, click on "symbol" and scroll down until you see the micro symbol and click on it. In MS 2003 it's about 8 lines down in that menu.
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The manufacturer's data sheet actually recommends using two capacitors with any 3-terminal regulator in the 78xx family: a 0.33µF on the input and a 0.1µF on the output. the input capacitor functions mostly as a filter capacitor the output capacitor functions mostly as a decoupling capacitor Ho…
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4-core 630 mm-sq cable sounds like 4 cores each of 630 mm-sq as used on 400 kV power lines, in which case it carries 4 times the current.
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Yes, a 200 volt squirrel cage motor can be run with about 100 volts.
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The load current will lead the supply voltage by some angle greater than zero degrees, but less than 90 degrees.
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KVa simply means Kilo-Volt amperes is a unit of electrical measurement. The kilovolt-amps passing along an AC supply are found by multiplying the voltage in kV by the current in amps.
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That depends on both the input signal and the type of amplifier the transistor is used in.
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Let's start by getting the symbols correct. The symbol for kilowatt is 'kW', not 'kw', and the symbol of megavolt ampere is 'MVA', not 'mva' -remember, a lower-case 'm' represents 'milli', not 'mega'! The true power output of a generator depends on the power factor of the load, so if a generator is …
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Yes, you can use an encoder other than the ready made ESCs to build a brushless DC motor controlled for a quadcopter.
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Four constraints should be taken in optimal placement of capacitor problem for voltage improvement using the Particle Swarm Optimization.
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This is most easily done using an oscilloscope with a current probe. Also phase angle must be measured relative to something else, usually the AC voltage at one end or the other of the branch of the circuit where the current is being measured.
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RTCC (Remote tap changer control) panel is one of the LT panel which has microcontroller, contactors, relays etc it senses the fluctuation in distribution voltage (input of Transformer) & give signal to OLTC to change the voltage(Output of the transformer) to set a value
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Q1: A PN juncrion has to be reverse-biased for a transiton capacitance to exist. In forward bias there is no depletion layer and the junction conducts, so it does not behave as a capacitance. Q2: In a common-emitter circuit the ouput voltage appears across a resistor connected between the collecto…
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high voltage side call primary
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High voltage transmission and distribution lines utilise three-phase electricity. There are two commonly-used connections used in this system, termed a 'delta' and a 'star' (or 'wye') connection. A delta connection provides three energised conductors, termed 'line conductors', while a star connectio…
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The advantage of a full wave rectifier is that it produces less ripple and the ripple has a higher frequency, making it easier to filter. The advantage of a half wave rectifier is it is simpler and less expensive as it needs fewer components. Which is best in a given application however requires…
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(In New Zealand) there will be a fuse associated with each electricity consumers line, and when the demand exceeds its rating, (~100A) it will pop, requiring re-wiring, in the same way as a lower current fuse on your power meter. On an utility circuit they do not have fuses, instead they have circu…
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No. Alternating Current and Direct Current are the only two types of current.
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A power transformer is a static electrical device that transfers energy by inductive coupling between two of the winding circuits. Answer Transformers are categorised in several ways, which makes life difficult. Generally, a 'power transformer' is a large transformer used to change voltage levels…
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Yes, that is almost true, apart from a very small copper loss in the primary winding that carries the small magnetising current. The core loss (iron loss) depends on the applied voltage. This loss is measured by the open-circuit test, carried out at the working voltage.
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Closed circuit
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That depends on both the UPS and type of motor, so there is no simple answer. Many types of motor will not run correctly unless the AC power is true sinusoidal waveform, and many inexpensive UPS units do not provide a true sinusoidal waveform; so in this case it cannot be done. But in other case…
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The cable size feeding 75hp-3phase motor is 16mm square in measurement.
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Adding a resistance in parallel to another resistance will reduce the equivalent resistance. Parallel Equation:R1 = 10ΩR2 = 20ΩReq = R1R2/(R1+R2) = (1/R1+1/R2)-1Req = 10•20/(10+20) = 6.67Ω
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Grounding plates work better in the desert areas because of the vast land.
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Yes, the surge protectors circuit breakers can be reset an unlimited number of times.
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There is a misconception that a step-up transformer 'steps up voltage, but steps down current'. Nothing could be further from the truth!The secondary current of any transformer is determined by the secondary voltage and the load which it supplies. It is NOT determined by the primary current!In fact,…
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to force the generation machines ( generator in power plant) to work on constant speed which mean constant frequency for any power networkn= 120 F / p
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if you connect a 0.5 ohm load to it, the power supply will try to push 4 amps through it. but 4 amps@ 2 volts is quite a lot, and it may not succeed.
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Yes, most of the surge strips have an in-built motherboard.
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A circuit breaker shuts off the power to an electrical circuit when it detects too much current flow. As electricity moves through wiring, an electromagnetic field develops around the wire. Electromagnetic breakers capitalize on this field production by using electromagnets. The current that moves t…
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An antenna is analog it is not classified as being a digital device.
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You will get a meaningless false reading either way because the converter outputs are floating (i.e. not connected to a fixed reference). You can only measure such outputs with reference to each other.
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-- In a parallel circuit, if one wire is disconnected, it won't shut off the whole circuit. If the circuit was series, one disconnected wire would shut off all the electricity to everything. -- When electric things are in series, the one that needs the most power gets the least, and the one that…
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Voltage Fighter Gowcaizer happened in 1995.
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High Voltage Festival was created in 2010.
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That is what the device is designed to do. The surge protector's circuit breaker will trip if a surge or overload is detected to protect the given equipment in question.
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The potential transformer is used in the electricity supply industry to measure accurately the voltage being used. The current transformer is basically a step down transformer.
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An electrical overload can cause electrical fires and damage your expensive electronics if not protected.
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The fuse is kept in box to avoid misuse. <<>>Fuses are packaged in boxes for shipping purposes and to prevent physical damage from hitting each other before being used in an installation.
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two, if both are resistors one, if the resistor is in parallel with any other type of component
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Unfortunately there isn't enough information to give you a complete answer. Which stepper motor are you using?
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All equipment has a working range of voltages it can run on, usually based around 120 v or 240 v in the USA and 230 v in Europe. Any voltage that the appliance will not run on is undesirable. <<>>The most undesirable voltage is a voltage that is caused by static electricity. The worst wo…
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There's no need to calculate this. The circuit voltages all equal the supply voltage.
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The *total*? It's the same as the supply voltage. For any one resistor? Use Ohm's Law: V = I x R. Or, if you have just two resistors, and know the drop across one (call it R1), then the drop across R2 is (VR2 = Vsupply - VR1).
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Three phase systems are used all over the world because they offer an efficient method for transmitting power, and they also allow superior electric motors to be used. A three-phase system can transmit 3 times as much power as a single-phase system of the same voltage and current, while needing onl…
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A ring-main unit (RMU) is a versatile type of high-voltage switchgear used to connect devices, such as transformers, to a ring main. An RMU consists of three separate 'switches', which enable various configurations to be set up at the RMU. For example, it can be used to disconnect the transformer fr…
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With a lagging power factor the phase of the current lags the voltage, as happens in an inductive load. With a leading power factor the current phase leads the voltage, as happens in a capacitor. A lagging power factor is usually the problem in electricity supply. A load such as a motor with a lagg…
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The starting current is high because when the motor is not rotating no back-emf is generated, leaving the starting current to be determined by the armature resistance, which should be low.
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The main breaker switch for a home is usually located in a breaker box attached to a side wall outside the home. The breaker box is usually situated about 5-6 feet up the wall and is usually gray. The main breaker switch will be in that box. Open up the breaker box by pulling on the front bottom or …
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Depends on the voltage. <<>>There are zero amps in 5 kW. The equation that you need to use is I = W/E. Amps = Watts/Volts. 5 kW is equal to 5000 watts.
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it is the top or bottom of the equipment..........
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Theoretically 22 kW is equivalent to 29.5 HP but there are some power losses in the motor and the probable maximum output of mechanical power is 25 HP.
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You've not stated which is the original, and which is the replacement. Answer: maybe, maybe not. It depends on the circuit, and whether the replacment is to be larger or smaller.
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Conventional LEDs are made from a variety of semiconductor materials, and radiate at different wavelengths all the way from infrared to ultraviolet. Their forward voltage drops range from about 1 volt to 6 volts, depending on the materials used. Any bias greater than the diode's forward voltage drop…
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The description "operational amplifier" is abbreviated to "op-amp". In certain circuit arrangements it can be used to do specific tasks beyond mere amplification, eg integration or differentiation.
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A synchronous motor is having a rotor fed with a dc supply and stator with a 3 phase ac supply.The rotor acts as a permanent magnet since dc current flows through the rotor windings. The stator wdg fed with a 3 ph ac supply produces a revolving magnetic field which is in the vicinity of dc magnetic …
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fault level at Transformer terminal= 3xVphxIphwhere voltage is expressed in kV and current in kA.
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It is depending on : whether the ac power is 110 or 220 v , length of wire/cable from mains to CB(circuit breaker),diameter of wire/cable consumption of circuit ( How much watts the circuit consume) i.e load .. don't forget this relation I=V/R . where I= current (amps) , V=voltage & R= resistanc…
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Power (Watts)/ Decibels (if the speaker is efficient) 2 Watts = 93 decibels 4 Watts = 96 decibels 8 Watts = 99 decibels 16 Watts = 102 decibels 32 Watts = 105 decibels 64 Watts = 108 decibels 128 Watts = 111 decibels 256 Watts = 114 decibels 512 Watts= 117 decibels 1024 Watts = 120 decibel…
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A system which can accommodate large inter-area transfers is generally more robust and flexible than a system with limited ability to accommodate inter-area transfers. Thus, transfer capability can be used as a rough indicator of relative system security. Basically power is the work done per uni…
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Strictly speaking, it's energy flow that has direction -the term 'power' merely describes the rate at which that energy is flowing. Having said that, however, the term 'power flow' is indeed used, but it must be understood that the term is really describing the 'rate at which energy is flowing'. The…
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It is an AC powered vehicle. It has an 88KW Magnet AC Synchronous Motor
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power is the product of voltage and current
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You can increase load on a bus power system by increasing the bus active power demand ans reactive power demand.
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Voltage AC was created on 2004-12-14.
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Induction motor is an AC electric motor which uses electromagnetic induction to induce the electric current in the rotor to produce torque.
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it depends upon the application; a more advanced model may have a thermo-switch.
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The population of High Voltage Software is 95.
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IEEE Life Member Graduate Study Fellowship in Electrical Engineering was created in 2000.
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Battle of Phase Line Bullet happened on 1991-02-26.
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