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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
Which is a higher rank a electrical engineer or a electrical supervisor?
The role of Electrical Engineer is "higher ranking" and generally higher paid. An engineer will deal with more of the design and client liason leaving the supervisor as the "man on the workface" dealing witht the day to day elements of work.
An Engineer is required to have a relevant degree in engineering in order to achieve his title.
When using series-opposing voltage sources?
of course...by connecting parallel resistor to it ,,so when v look from load end there will b a voltage as well as resistance same to that of voltage source..
What are the disadvantages and advantages of parallel circuit?
Abraham Lincoln preferred them to perpendicular circuits.
30 volts.
Is it possible to use optic fiber as a core in the transformer?
No. Transformers operate on the principle of conversion of electric current to and from magnetism. Optic fiber is not ferromagnetic, nor is it conductive.
What is the Clipping circuit transfer function?
Transfer function is the relationship between output and input of a circuit. In the clipping circuit, the general transfer function is such that the transfer curve Av is less than 1 for passive limiter and greater than 0 to limit the maximum and minimum voltage value.
How do you convert Amps to KVA for a single phase system?
use 1.0 as your PF Understand that K=1000, so KVA simply means thousands of volts times amps. First, multiply KVA by 1000 to get VA, then divide by the voltage of the system to get amps. Example: 6KVA, 240V single-phase. 6 * 1000 = 6000 VA 6000 / 240 = 25A
It would be a lot of trouble for me to try to explain the working principle of ground resistance tester since my English is no so good but fortunately I can give you the right internet address so you can download the exact information you need: www.dranetz-bmi.com/pdf/groundprinciples.pdf
Alexis
Havana, Cuba
Point three three or 1/3rd of a volt will power any piece of equipment that is designed to operate on that voltage.
To put it into perspective 1 volt = .33 volts x 3.
How power factor is related to air gap?
Lesser air gap, less is the magnetising current (which is lagging reactive component of current)causing better p.f.
Why 1000 kva transformer will call 1 mw?
A 1000 kVA transformer is often referred to as 1 MW because the power factor is typically considered to be 1 (or unity) in such calculations. In electrical systems, kVA (kilovolt-amperes) measures apparent power, while MW (megawatts) measures real power. Since 1 kVA is equal to 1 kW when the power factor is 1, a 1000 kVA transformer can deliver up to 1000 kW or 1 MW of real power under ideal conditions. However, in practical applications with a power factor less than 1, the actual real power delivered may be less than this maximum.
What happens to the current Amps flowing in a circuit when you raise or lower the frequency Hertz?
<> <> <> This question is not asking about household power circuits which typically have an almost constant frequency of 50 Hz or 60 Hz. If a circuit includes inductance and capacitance then the answer below, marked by *** is incorrect. That answer is correct for purely resistive loads only.
An electric motor has inductance as well as resistance. The circuit inside a typical fluorescent light fixture contains a ballast - which has resistance and inductance - and a tube, which has capacitance, inductance and resistance. The currents flowing in the motor and the fluorescent light fixture would vary considerably if the frequency of the applied alternating voltage was allowed to alter.
Two other common examples:
i) a Hi-Fi or similar audio amplifier, driving a loudspeaker: the speaker has a coil in it which has inductance. The current (and hence the output power) of the speaker varies considerably with the audio frequency, typically between 20 Hz and 20,000 Hz (20 kiloHertz). For that reason different sized speakers - such as tweeters, mid-range, woofers and sub-woofers - each having different sizes of inductance and capacitance, are commonly used to produce the best "total overall sound output" from an amplifier.
ii) a tuning circuit for a radio: this must use both an inductance coil and a tuning capacitor. The current flowing in those components varies enormously between "out-of-tune" and "in-tune" settings of the tuning capacitor which makes the circuit tune "in" and "out" of radio frequencies in a specific range which the tuning circuit was designed to handle. Radio frequencies range between 50 kiloHertz and hundreds of GigaHertz or more. <> <> <> Changing the power source from AC to DC may have an effect on the current drawn but is dependent on the nature of the load. Any device is designed for AC or DC operation but rarely both. <> <> <> *** Note: the following answer is incorrect except for purely resistive loads. ***
The frequency of an AC voltage line has no effect on the current drawn for any given power. Voltage does have an effect on the current. <><><>
Who does the word volt come from?
The volt is named in honor of the Lombard physicist Alessandro Volta (1745–1827), who invented the voltaic pile, possibly the first chemical battery. http://en.wikipedia.org/wiki/Alessandro_Volta#Honors
How much does an ammeter hold?
An ammeter does not 'hold' anything. It is an instrument used for measuring the instantaneous flow of electrical current known as amps (short for amperes) - or the actual passage of electrons through a circuit. One ampere is the amount of electrical current flow (symbol 'I'), in a closed electrical circuit when a potential of one volt (symbol 'V') is applied through a resistance of one ohm (symbol 'greek capital letter omega'). One ampere is 6.28 billion billion electrons per second. More than anyone can imagine.
Manufacturers of ammeters produce instruments of different capacity (which may be the root of your question), meaning the maximum value of amperes or upper limit of measurement of the instrument. Some measurements can also be too small or too large to be expressed directly as amperes, so instruments are designed with more sensitivities or less sensitivities to suit the measurement at hand.
Does a voltage have one terminal?
No. Voltage is the potential difference in energy between two charges. (Volts is joules per coulomb.) Since it is potential, that means it is relative, and in order to be relative, there must be two terminals.
Can not get manual shift into reverse when motor is running?
A lot of newer cars have a "lever" you must lift to shift into reverse. It's a safety feature to keep from throwing your car into reverse instead of 5th gear. Mine is a ring right below the knob that you lift up. See if you car has something similar.
How does low power factor effects conductor size?
A load with a low power factor draws more load current than necessary, so the supply conductors need to have a greater cross-sectional area than would otherwise be necessary.
What is hall effect hall voltage?
The Hall effect is the production of a voltage difference (the Hall voltage) across an electrical conductor, transverse to an electric current in the conductor and a magnetic field perpendicular to the current. It was discovered by Edwin Hall in 1879
For 250 KVA transformer how many KVAR to be paralleled for no load loss?
No load losses are real power losses (in watts, not vars), so I'm not sure what you're talking about. If you're trying to parallel a transformer with another one to try to cancel out no load losses, you can't do this. These losses are also called core losses and are the price you pay to energize a transformer.
Difference between online and Offline UPS?
An off-line UPS remains idle until a power failure occurs, and then switches from utility power to its own power source, almost instantaneously. An on-line UPS continuously powers the protected load from its reserves (usually lead-acid batteries or stored kinetic energy), while simultaneously replenishing the reserves from the AC power.
The on-line type of UPS, in addition to providing protection against complete failure of the utility supply, provides protection against all common power problems, and for this reason it is also known as a power conditioner and a line conditioner.
Regards, Suresh ViIjaykumar ,
