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Electrical Engineering
Electrical engineering is a field of engineering that deals with the study and application of electricity, electronics and electromagnetism.
23,056 Questions
Difference between voltage transformer and capacitive voltage transformer?
A capacitor voltage transformer (CVT) is a transformer used in power systems to step down extra high voltage signals and provide a low voltage signal, for measurement or to operate a protective relay. Inductive voltage transformers use conventional magnetic material for coupling of HV and LV circuit. This method has problems due to insulation of EHV circuit to the magnetic core( usually at ground potential) and very expensive to produce as it may need a few step down stages to achieve to final voltage ratio, each stage shall be floated at gradually reducedvoltage relative to ground potential.
Is a commutator the rotating element of a motor?
The commutator is part of the armature on a DC motor and this assembly is the rotating element of a motor.
When is it usually desirable to connect cells in series?
In electronics circuits current is common in series circuits and voltage is common across parallel circuits. LEDs in series draw less current, but require more voltage. Total power remains the same until multiple drivers are introduced in a parallel configuration.
What is the fluid in a fluorescent light bulb?
In a fluorescent light bulb there is usually a drop of mercury. That mercury vaporizes as the bulb warms up and it becomes gaseous, enhancing the electron interaction through the bulb, making it brighter.
What is the color code of resistor value 0.1?
A 0.1 ohm resistor is color coded brown (1) black(0) silver (x 10-2).
What is the difference between Cold rolled steel and hot rolled steel?
Hot-rolled sheet has low hardness, easy processing, good ductility and cheaper price. Cold rolled sheet has high hardness, relatively difficult to process, but not easy to deformation, higher strength. If you want to buy cold-rolled steel, you can go to the official website of Changzheng, the price of Changzheng's steel is moderate, and it is the choice of the public. Buy cold-rolled steel plate recognized Changzeng.
How to replace fuses in a 1996 Thunderbird?
The fuse box is located under the dashboard on the driver side. Dumb question
Can a 600 volt 3phase electric motor run on 1phase?
Yes it can run when single phasing in a delta configuration but the motor will not start from a dead stop. There will be quite a bit of degradation in its operation from its nameplate data.
Has the maglev train ever crashed?
Only one reported incident in Lathen Germany in 2006 during a test run where 23 people died. Accident was caused by human error not Maglev technology when a maintenance vehicle was on the track at the same time as the Transrapid train.
What is the difference between an intermediate class to station class surge arrester?
Station Class: Station class arrestors are typically used in electrical power stations or substations and other high voltage structures and areas. These arrestors protect against both lightning and over-voltages, when the electrical device has more current in the system than it is designed to handle. These arrestors are designed to protect equipment above the 20 mVA range.
Distribution Class: Distribution class arrestors are most commonly found on transformers, both dry-type and liquid-filled. These arrestors are found on equipment rated at 1000 kVA or less. These arrestors are sometimes found on exposed lines that have direct connections to rotating machines.
How should a voltmeter be connected to measure voltage of a component?
Since voltage is electrical potential difference, to measure the voltage across a component, you place the voltmeter across, or in parallel with, the component.
What is the advantages of dielectric heating?
a major advantage of this form of heating is the ability to repadily heat throughout the volume
Can you wire a 240v single phase and nutral UK motor to 240v 2phase supply in Canada?
In North America, you can connect a 240-V load across two lines (not 'phases') of a three-phase system with a 240-V line voltage. In Europe, you would need to connect the load between any one line conductor and the neutral conductor.
Over 5,000 years ago lamps were invented. The Egyptians had oil lamps.
How do you Describe the problems that can occur with the wiring and testing operations?
Testing and wiring should be carried out by a qualified , trained technician / engineer so that the electrical devices and wiring are properly done with safety.
What is the reason behind the lag of current in inductor lead in capacitor?
The physics of the energy storage. In an inductor, the current must fight against the stored energy in the magnetic field which tries to keep the current unchanged. Any change in the current lags the voltage since the stored energy impacts the adjustment.
Similarly, the "displacement" current in a capacitor leads the electric field buildup in a capacitor, causing the voltage to lag the current until the stored energy building up in the electric field stabilizes. Any change in the voltage is first preceded by a change in the displacement current.
What does 70MW equal to in kWh?
1 mw = 1000 kw
watt = v*a (volt x amp)
1000 watt = 1kw
when a machine or device that consumes 1 kw in order to operate does so during 1 hour - then we say 1kwh or 1kw/h.
there is no conversion from plain MW to KW/H - the time factor in the MW expression is missing.
Hope helps you.
The term, 'negative ground' or 'negative earth' refers to the system of chassis-grounding, or chassis-earthing, used in vehicles. With this system, the negative terminal of the battery is directly connected to the metal parts of a vehicle, while the positive terminal is connected to the various electrical devices (lamps, etc.) using insulated conductors. The vehicle's metal parts ('chassis') then act as the return conductor to the battery.
What is the energy use difference between low voltage lighting and line voltage?
A low voltage electrical system consists of a transformer and an output of about 12 volts. It is frequently used by a home owner to run a wire along the ground to put lights along a walkway. If an animal bites the wire or someone cuts the wire and touches the loose ends, he will get a shock but it will not do major damage. Unlike regular house current, it will not kill.
AnswerAccording to BS 7671:2008, Requirements for Electrical Installations, more commonly known as the Wiring Regulations, nominal a.c. voltages are defined in the UK as follows:
- Extra-low voltage: not exceeding 50 V a.c., whether between conductors or to earth.
- Low voltage: exceeding extra-low voltage, but not exceeding 1000 V a.c. between conductors, or 1500 V a.c. between conductors and earth.
- High voltage: normally exceeding low voltage.
What is the difference between variable transformer and ordinary transformer?
Variable transformer may also refer as auto transformer. We can vary the output voltage of the transformer. But in the ordinary transformers output voltage is already designed.
How are magnets and electrical generators related?
Electrical generators have sliding magnets that go back and forth to create mechanical energy in them....and that's why they are related.
Tell some advantages of superposition theorem in circuit analysis?
It is applied not only for the elements f the network but also for the sourcesssss
To convert from KVA (kilovoltamperes) to KWH (kilowatthours) first convert to KW (kilowatts) by multiplying by power factor. Power factor is the cosine of the phase angle between voltage and current. Then multiply by the number of hours that you run the load.
