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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
What is the difference between BA electrical engineering and BS electrical engineering?
Electrons flows through Only conductor its called electrical , electrons flows through the gas, vacum,semiconductor is called electronics .... the word elecronics means electrons present in all materials, in Electrical deal RMS voltage ,in eletronics deal with peak voltage , In electrical generation of power and distribute the generated power to any where . Electronics is based on electrical.
What is phase 2 of causality assistance?
Phase 2 of causality assistance typically involves refining the initial understanding of causal relationships identified in Phase 1. This phase focuses on validating and testing these relationships through more rigorous methods, such as experimental designs or advanced statistical analyses. The goal is to establish stronger evidence for causation rather than mere correlation, ultimately leading to more reliable insights for decision-making and intervention strategies.
How does an earthing transformer work?
Measurements of electric currents
AnswerA current transformer allows high values of a.c. current to be measured using an ammeter designed to measure lower-values of a.c. current. At the same time, it electrically isolates the primary circuit from the secondary circuit -essential if the primary circuit is part of a high-voltage system. CTs are also used to monitor primary currents for the operation of high-voltage protection relays.
What is the power output of 100 kw power plant?
Your question shows the importance of using the correct symbols, because your symbols are incorrect and, therefore, your question is confusing.
So, are you asking how many milliwatts (mW) there are in a kilowatt (kW), or are you asking how many megawatts (MW) there are in a kilowatt(kW)?
Notice that the symbol for a watt is an upper-case W. The symbol for a milli is a lower-case m, and the symbol for a mega is an upper-case M.
If the former, then there are one-thousand milliwatts in a watt, and there are one-thousand watts in a kilowatt, so there must be one-million milliwatts in a kilowatt.
If the latter, then there are one-thousand kilowatts in a megawatt, so a megawatt must be one-thousandth of a megawatt in a kilowatt.
How you can do Calibration of voltmeter by potentiometer?
A: The only calibration that a potentiometer is allow to do is on the resistance scale. The reason being is the internal battery looses capability with age so to compensate the pot. will change current available to make the ohmmeter to go to zero when the probes are shorted. To test a volts range then an accurate voltage must be used to verify calibration.
What kind of protections must be provided to 33kv electrical feeder?
Typical protection for a radial system would be overcurrent protection - a mixture of definite time, instantaneous time, and time overcurrent for positive sequence, negative sequence, and zero sequence is usually used (negative sequence isn't used very often, but there are times when it is needed). These overcurrent protective devices will trip a breaker, circuit switcher, or similar device.
When feeds become extremely long, sometimes in-line fusing is used part way down the line as a cheap alternate to a recloser or breaker. The drawback is if a fault occurs, someone has to go out and replace the fuse, and you are typically at the mercy of the customer calling in and complaining before you will know a fuse is blown.
Why capacitor short circuit in ac and open circuit in dc analysis?
Reactance of capacitor is inversely proportional to frequency. I should not need to write the exact equation here, its in your textbook. All you need is that its inversely proportional to frequency for proof.
We will now assume an ideal capacitor to keep the analysis simple.
- at DC the frequency is zero, the inverse of this is infinite reactance: open circuit
- at low frequency AC frequency is low, the inverse of this is high reactance
- at midrange frequency AC frequency is midrange, the inverse of this is midrange reactance
- at high frequency AC frequency is high, the inverse of this is low reactance
- at infinite frequency AC frequency is infinite, the inverse of this is zero reactance: short circuit
This disproves your original statement as written, except for the special cases of DC and infinite frequency AC (which does not occur), for ideal capacitors.
As all real capacitors are nonideal, they have leakage resistance. This means that even for the special case of DC the capacitor is not a true open circuit, just a very high resistance resistor. Which also disproves it for the remaining case of DC in real capacitors.
What are the advantages of increasing the voltage in a circuit?
For appliances that need a lot of power, the advantage of a higher voltage is that less current is needed, because power = voltage x current. That means that the cable doesn't need to be so thick.
It also means that for a given percentage of voltage drop in the cable, the allowable volt-drop in the cable is higher when the supply voltage is higher. This also allows the use of a thinner cable especially when the cable is 100 ft long or more.
Will three phase power damage single phase appliances?
If you plug a single phase appliance into a three phase power supply, then you will be using single phase power. It does not matter if you are delta connected, AB, BC, or CA, or if you are wye connected, AN, BN, or CN. Yes, if there was "a problem", you would trip the supply. Question, however, is what do you define as "a problem"? Three phase power is intended to supply three phase appliances. Connecting a single phase appliance to three phase power is inconsistent with the objective, and such connection must have been performed by some kind of "jury-rigging". If you pull more than the trip current on any one phase, the supply should trip. If a malfunction in the single phase application, however, were to result in fault current that is lower than the trip current, you might not trip, and you might create damage and/or a fire. There is nothing wrong with building a branch circuit that feed a single phase load from one phase of a three phase source. You just need to provide the correct protection for that intended load.
all workers which includes the nearest point of the equipment they are operating, must stay 20 feet away from any power line if they do not know the voltage of the line; however, there are some power lines with very high voltages (over 250,000 volts) that more than 20 feet is required, but these high voltages lines are rare and usually semi obvious. If you know the voltage of the line, you may use the voltage chart found on google or the OSHA website that give you the distance you must maintain, still based on the voltage of the line. Workers, equipment, or material that must enter a less than 10 feet radius of a power line must be de-energized
before working in that area, you should contact a specialist from the power company to advise you on your options. Failure to de-energize
a line when working less than 10 feet is very risky since electricity has been know to jump off power lines onto equipment, people, or any object that offers the least resistance to the ground.
Ohm's Law is Voltage = Current x Resistance or written v - I x R. So if you raise the voltage and keep R the same current must increase to satisfy the equation. I = V/R. Similarly if you reduce R and keep V the same current will also increase proportionally.
Why can a light bulb act like a fuse?
A lamp must never be used as a fuse. But if you are asking why lamps sometimes burn out, rather like fuses do, then the reason is because if a voltage greater than its rated voltage appears across its element, its temperature may significantly exceed its design temperature, and the filament will melt.
It's not that simple.
The basic formula is Volts / Ohms = Amps.
For 30 Volts you'd get 0.5 Amps, for 60 Volts you'd get 1 Amp, for 120 Volts you'd get 2 Amps.
What happens if you change phase and neutral in 3 phase circuit?
breaker will trip, motor will smoke, a loud noise and possible arc if 480 volts or motor would run counter clockwise if crossed at motor j box or at the disconnect. always make sure junction boxes are made up properly before turning on power if over 100'
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LOL, but not a great answer. If phases get reversed in a three phase system, the only devices that would be directly effected are the connected motors. There is no effect to three phase resistive loads nor single phase loads connected off of the three phase service. There will be no smoke, loud noises or arcing. Most industrial and commercial installations have phase reversal instrumentation connected to the system that sense the incoming lines for just such a condition. This instrumentation is connected to a shunt trip breaker that will disconnect the service from the grid. The utility companies are very careful about re installing the proper phasing of downed lines after a storm and before energizing a new line installation.
What happens to the brightness of the bulb when the second bulb is put into a series circuit?
it should become dimmer
How much electricity will a 15 Hp motor consume in 1 hour?
1 hp equals 746 watts. The question confuses energy and power.
AnswerYou do not 'use' power. Power is the rate at which you 'use' energy. Your question is rather like asking, "How many miles per hour do you do in one hour?"
What is difference between substation and transformer?
Actually a substation transformer for a distribution substation will reduce the incoming voltage from 115,000 volts or 69,000 volts to a lower voltage closer to 7200 volts that runs down the power poles in your neighborhood. At your house there will be a small transformer that reduces the voltage from 7200 volts to 240 volts to meet the needs in your home.
Actually both are wrong !!
How is a watt meter connected?
There are two coils in watt meter namely current coil & potential coil.the two ends of current coil are 'M' & 'L' and they should connect in series with instrument. and the two ends of p.c. is 'c' which is connected to 'L'. and another is at the other end of instrument.There are two coils in watt meter namely current coil & potential coil.the two ends of current coil are 'M' & 'L' and they should connect in series with instrument. and the two ends of p.c. is 'c' which is connected to 'L'. and another is at the other end of instrument.There are two coils in watt meter namely current coil & potential coil.the two ends of current coil are 'M' & 'L' and they should connect in series with instrument. and the two ends of p.c. is 'c' which is connected to 'L'. and another is at the other end of instrument.
How do you reduce core losses in distribution transformer?
Reducing core losses is a design responsibility of the manufacturer. They do this by laminating the core (to reduce eddy-current losses) and carefully selecting the type of material used for the core (to reduce hysteresis losses). There's very little that you, as the user, can do about reducing core losses.
How much does nuclear energy cost?
That is impossible to answer. There are many kinds of chemical energy and each costs a different amount. AA batteries are chemical energy. A car battery is chemical energy. Gasoline is chemical energy. Food is chemical energy.
Which loads are inductive load?
- electric motor
- relay coil
- speaker coil
- speedup coil (in vacuum tube or discrete transistor digital logic)
- etc.
Which conditions refers to a reduced voltage levels of AC power that lasts for a period of time?
Reduced voltage levels of AC power that lasts for a period of time is known as a brownout.
Why is a 'short-circuit'in a mains circuit dangerous?
It is potentially dangerous because it provides a low-resistance path across the supply voltage. That causes excessive current to flow, and if all is well a fuse or circuit-breaker will operate to shut off the supply. Without that there might be enough current to cause a fire.
