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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
Why inductor use in series capacitor in parallel?
That depends on the type of circuit you are talking about. Sometimes both an inductor and capacitor are both in parallel with each other. This is called a tank circuit. Sometimes they are both used in series. These are both examples of resonant circuits.
Sometimes the inductor can be in parallel with an applied voltage and the capacitor in series. This is a form of high pass filter. On the other hand, the inductor can be in series and the capacitor in parallel to for a low pass filter.
When load on a normally excited synchronous motor is increased its power factor tends to what?
approach unit
Why repeaters are placed over hilly area?
Long Distance Communications these days is handled by Microwave Towers. The good news is that these towers can be placed large distances away from each other so large distances are covered. The bad news is the towers must be in line-of-site of each other or the signal will be lost. Hilly areas are a good example of bad line of site.
Coulomb is the basic unit of charge in the MKS system. It is the charge which flows per second in a DC current of 1 ampere, about 6*10^18 electrons.
Batteries and capacitors both store charge. They also both store energy. Charge and energy are not equivalent, but are related somewhat like momentum and kinetic energy.
Why root 3 used in 3 phase system?
In a 3 phase, star connected system, the phase to phase voltage and phase to neutral voltage is calculated using root 3. That is, phase to phase voltage is root 3 times phase to neutral voltage. Also to calculate three phase power the voltage and current is multiplied by root 3 to obtain 3 phase power with unity power factor.
AnswerIf you vectorially-add two quantities that are displaced from each other by 120 degrees, then the resulting quantity will be 1.732 (i.e. the square-root of 3) longer. Try it for yourself.
So, for a wye (star) connected system, the phasor (vector) sum of two phase voltages will result in a line voltage that is 1.732 times larger than a phase voltage. For a balanced wye (star) connected load, the phasor sum of two phase voltages will result in a line current that is 1.732 larger than a phase current.
Where can Kerastase Resistance be purchased?
"Kerastase Resistance" is a product made by L'Oreal. One can purchase this item at most local retailers, including the "Amazon" and "Overstock" websites.
Will maximum current flow through 0 ohms of resistance?
In theory, you would get infinite current. But, of course, in practise, this cannot happen, as any large current would cause severe damage to the source supplying that current, not to mention the conductors involved. Protection against such currents would be provided by a fuse or circuit breaker.
What is characteristics of LVDT?
1.Null Voltage
2.Resolution
3.Linearity
4.Sensitivity
5.Excitation voltage and excitation frequency
6.Dynamic response
The full form of MCCB is "Molded Case Circuit Breaker." It is an electrical device used to protect electrical circuits from overloads and short circuits. MCCBs are designed to automatically disconnect the circuit when they detect faults, helping to prevent damage to electrical equipment and reduce the risk of fire.
Calculation of restricted earth fault relay stabilizing resistor?
Requirement of REF protection for 50KVA 11KV/.4KV transforemr
How noise occur in positive terminal?
noise do not occurs in positive terminals noise like all signals must have a return to be seen as evidence
the network having different relation betwwen voltage and current for two possible direction of current.
You have to connect one conductor from potato to one terminal on light bulb and the other to the second conductor. Your light bulb must be a low voltage and low current bulb because a potato delivers very little power. Light bulbs that screw in would have one connection point on the screw in part and one at the bottom of the base of the bulb. It would be best to put the bulb in a socket that would allow easier connection of wires instead of trying to wrap the wire around the bulb.
How do you calculate power factor if line voltage and line current are measured from motor terminal?
Power factor is the ratio of true versus apparent power. For example, a power factor of 1 means that one watt of measured power is one watt of real power, while a power factor of 0.5 means that one watt of measured power is two watts of real power.
To measure power factor, measure voltage, current, and the phase angle of current related to voltage. Phase angle is between 0 and 360 degrees, 360 degrees being one line cycle.
A power factor of 1 means that the phase angle is 0 degrees.
A power factor of 0.707, assuming that voltage and current are measured on the same scale, means that the phase angle is 45 degrees. It would be +45 degrees for a capacitive load and -45 degrees for an inductive load. You can use trigonometry, sines and cosines, to figure this out, or you can use the pythagorean theorem to figure this out - its just a right triangle where the angle is the phase angle.
By the way, a power factor of -1 means the load is actually a generator, and a power factor of 0 means the load is a pure capacitive or inductive load with a phase angle of +90 or -90 degrees.
Power factor is a concern because watt-meters measure apparent power. If the power factor is too low, it will seem that the energy used to lower than reality. The problem is, even in the worst case of + or - 90 degrees, energy is still required to move the current back and forth in the circuit, and that energy must come from the power supply. That's why we talk volts-amps (VA), volts-amps-reactive (VAR), and watts (W) in AC circuits, and none of them are the same thing.
Sometimes called a snubber. It often consists of a zener diode wired so that some voltage or other cannot exceed the zener voltage. Others use transistors or FETs in more active topologies. The ultimate is a crowbar limiter which simply shorts out a power supply if it exceeds a certain voltage, thus rupturing the supply fuse.
(I sometimes refer to them as Sayonara circuits.)
What is the 2nd hot wire color is for 230V single phase for Europe?
In North America, residential supplies comprise two line ('hot') conductors and a neutral. The nominal potential difference between the two line conductors is 240 V, and the nominal potential difference between each of the line conductors and the neutral conductor is 120 V. Heavy appliances operate at 240 V, while most other appliances operate at 120 V.
Unlike North America, however, a European single-phase residential system comprises a single line conductor and a neutral conductor, with a nominal potential difference of 230 V. All appliances then operate at 230 V. The line conductor insulation colour is brown, the neutral is blue, and the earth (ground) is either bare or covered with yellow and green striped insulation.
For three-phase systems, the EU Harmonisation standard is:
Three-phase line conductors: brown/black/grey
Neutral conductor: blue
Earth (protective) conductor: green with yellow stripe
Can a 440 - 480V 60Hz motor run in a site with 380V 60Hz supply If No how can it work?
The motor will run, probably at nearly the same speed, but it cannot supply the same mechanical load. If it can be run on a lighter load, proportional to the voltage, it should be OK.
What is a single layer winding?
A single layer winding refers to a type of coil configuration in electrical machines, such as transformers or inductors, where the wire is wound in a single layer around the core without overlapping turns. This design simplifies the construction and can reduce the overall size of the winding. Single layer windings are often used for applications requiring lower inductance and are typically easier to manufacture and troubleshoot compared to multi-layer windings. However, they may have limitations in terms of efficiency and heat dissipation compared to more complex winding arrangements.
What kind of provider is a licensed DC?
A licensed DC, or Doctor of Chiropractic, is a healthcare provider who specializes in diagnosing and treating neuromuscular disorders, with an emphasis on treatment through manual adjustment and manipulation of the spine. They focus on the relationship between the body's structure, primarily the spine, and its function, aiming to alleviate pain and improve overall health. DCs often employ various techniques, including spinal adjustments, physical therapy, and lifestyle counseling, to support patient wellness. They are licensed to practice in all 50 U.S. states and may work alongside other healthcare professionals.
Where is the idle speed control motor located on a 1990 f-150?
idle air control motor
where is it located
How do you wire a Bridgeport Mill running on 440 3ph to 240 3ph?
Hi there are a few options. The one I chose was to use a VFD (variable frequency drive). First though if you want to run off true lower voltage you will need to check that the motors can be reconfigured to run as delta instead of star. If you look at the motor plate this should give you some idea. If you are lucky the motor terminals will have links that let you move them to reconfigure. If not you will have to research further on the net. If you use a vfd instead of a rotary or static inverter then you will have to connect the output of this directly to the motor ie with no switches in between. All the control like forward, reverse etc are them controlled as low voltage inputs to the inverter. With a rotary or static inverter it is possible to feed the output of these inverters to the supply of the existing wiring but motor voltages and contractors may not work on the reduced supply.
