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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
yes but voltage will be out a little.
This ok for something like a heater which wont care.
But for an electric motor starting and overheating maybe a problem.
In the US this would be 220v single phase and 208 volts 3 phase.
What is the electricity voltage in Brazil?
Generally it is 110 V, 60 Hz (the same as in the USA and Canada).
They do, however, generally use a hybrid plug that will accept either the A/B type "blade" plugs as used in the US and Canada, and also accept the continental Europe-style plugs with round tines (although still with 110V/60Hz, not the European 220V/50Hz).
That said, in some places (especially in hotels) there are also outlets available that provide 220V; these are almost always marked as "220." And, when such outlets exist, they are usually accompanied by 110V outlets (which are either marked "110" or, more commonly, not marked at all).
If in doubt, ask the hotel staff or someone else in charge of the property where you are.
Typical Brazilian outlet (this one is 220): http://www.kropla.com/brazil_power.htm
It really depends on where you are going to visit. Typically the Southern states of Brazil run on 110v, but in the north, where we live (Tocantins) the energy is 220v. The state of Maranhão also uses 220v. As stated above while traveling in Brazil it is best to ask.
The domestic voltage in the USA and Canada is 120v 60Hz, not 110v as you have stated. I know this as my company has imported 120v machines from the USA for years and our customers in the UK run them without problems from a site transformer that gives 110v 50 Hz.
But it is very interesting to learn that in Brazil it is 110v because we have an enquiry from Brazil for a 110v machine (which is why I consulted wiki answers)
AnswerThe voltage in Brazil is either 110 V/ 220 V @ 60 Hz (the US and Canada are 120 V @ 60 Hz). Usually when a country has both voltages, hotels provide sockets for both for convenience. Brazil uses sockets A, B, or C (the US and Canada use A, and B) ( voltageplugregion.com )
Under what condition is a transformer connected in star?
Depends on the design criteria. A grounded star transformer winding will provide zero sequence (ground) current, so it can be used for polarizing of protective relays. The extra ground current may be a requirement of the system to guarantee protective device operation.
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The three phase windings in a generator / transformer / motor can be interconnected in two ways:
STAR
If the similar ends of the coils are connected together and the other ends are connected to the 3 incoming supply service lines, that is called "star connection". The internally-connected point is brought out as the "neutral" connection. The service "line-to-line" voltage (between any 2 lines) is 1.732 times the voltage between any line and neutral. Thus we can get two voltages for distribution within a building or site to supply lighting and power. However the service line currents are the same as the phase winding currents.
DELTA
If the dissimilar ends of each winding are labelled A and B and the three windings are then connected together B->A, B->A, B->A, and the 3 incomiing supply service lines are then connected to the junctions, it is called DELTA. Here the values of line voltage and phase voltage are the same while the service line currents are 1.732 times the phase winding currents.
Additional AnswerIn Britain, the secondary windings of a three-phase distribution transformer are always star- (wye-) connected, with the star (neutral) point earthed. This provides a three-phase distribution system, with 400 V between lines, and 230 V between line and neutral. Residences are connected line-to-neutral, providing 230-V single-phase service; premises that require three-phase supplies are provided with three lines and a neutral.
What are specialty areas in electrical engineering?
Microelectronics, digital circuits, analogue circuits, transmission lines, Radio Frequency (RF), power, high voltage, integrated circuits, computers, networking and many more.
Safety devices used in electrical circuits.
AnswerA fuse is an overcurrent protection device, and will operate in the event of a sustained overload current or a short-circuit current.
How will amps and current differ in a series if you get resistors with different resistance?
-- "Amps" and "current" are the same thing. Electric current is measured in units of Amperes.
-- The current is always the same at every point in a series circuit, no matter how many
resistors of the same or different values are in the circuit.
What are the application of ohm's law?
By using Ohm's law, you are able to find the resistance of a circuit, knowing only the voltage and the current in the circuit.
In any equation, if all the variables (parameters) are known except one, that unknown can be found. For example, using Ohm's law, if current (I) and voltage (E) are known, resistance (R) the only parameter not known, can be determined:
Basic formula:
Remove the divisor by multiplying both sides by R:
Result of step 2: R x I = E
To get R alone (on one side of the equation) divide both sides by I:
The basic formula, transposed for R, is:
How do you calculate no-load current and load current?
Full load current can be calculated by the formula given below: P=SQUARE ROOT OF 3*V*I*POWER FACTOR P=1.732*V*I*PF suppose 3 kw motor three phase voltage assuming .85 power factor and 415 volt full load current will be 3*1000=1.732*415*I*.85 I=4.9 ampere(full load ampere)
Is the electric field caused by an electron weakest near the electron?
The electric field is stronger near the electron and becomes weaker as the distance from the electron increases.
What is the formula to calculate the overload setting for a star delta starter?
Full load current ofthe motor x 0.58
What is the permissible neutral current?
I think you mean "what is the permissible imbalance between live and neutral current"
All current supplied by the live wire should exit via the neutral. Any imbalance leaving via Earth is detected by an earth leakage circuit breaker . They trip at about 30 mA.
What should the actual power in a resistor be?
The question needs some clarification / elaboration. The actual power in a resistor depends on how much electric current passes through it. There are plenty of topical (electronics type) web pages that provide a detailed technical explanation. Try Wikipedia. Or browse the technical section of your local library. A more useful question might be - "What value of resistor power rating should I select for a particular application?". So a secondary question would then be - "What is the application?".
What is difference between KV and KVA for transmission line?
KV, kilovolts, or kilojoules per coulomb is not the same thing as KVA, kilovoltamperes, or kilojoules per second, and no direct comparison exists. Please restate the question.
What is range of wire wound resistors?
There is no set range for these types of resistors. The biggest thing to keep in mind is the heat that is generated by the resistance and the applied voltage. The device should be large enough to dissipate this heat.
How do you mega ohm a motor 3 phase?
The megger leads are connected in the following manner. Black lead to motor ground terminal or motor frame. The other lead to one of the phase wires. Meg that coil to ground and note the reading. Do the same with the other two motor leads and note the readings. Look at all of the three reading that you have taken. Engineers like the reading to be above 5 meg. Preferred readings about 2 meg. Motor needs looking after below 1 meg.
What is the current through the 150 ohm heater?
At 110 volts it is 0.8 amps. At 220 it is 0.4 amps. I=E/R. I=amps.E=volts R=resistance.
What instrument measures current and voltage?
Voltmeter.
Current and voltage are two different things. They are closely related but a current does not imply a voltage and nor does a voltage imply a current.
A volt meter is used to measure a voltage. The voltage may be across a battery or other power source. It may be across a component such as a resistor or a group of components. If a current is flowing through a resistor, there will be a voltage across the resistor. Similarly, if there is a voltage across a resistor, there will be a current flowing.
Current is measured using an ammeter - Current is measured in amps, hence the name of the meter.
The two meters together can be used to analyze most electronic circuits and they are the two most important items of test equipment in electronics. Devices called multi-meters are combined ammeters and voltmeters and are in every electronics engineer's toolbox.
How do you calculate the forward resistance of a diode?
FIrst of all, figure out where your anode and cathode is, then take the cathode, connect it to the ground, in this case youre anus. And then take the anode, and connect it to the positive, again, in this case, your clitoris or penis (depends on your gender) then take a Digitial Multi Meter, and connect the positive in your left nostril, and take the negative and connect it to youre right nostril. If you feel aroused, then you are connected properly, if you feel depressed, youre connections are wrong.
Formula:
X(constant) = 1
Forward Resistance= 2+2-x-x(pubes)
Did Lewis latimers invention impact society?
Lewis Latimer was credited with several inventions, however the invention that had the greatest impact on society was his improvements to the electric lamp. Lewis was a member of the Edison Pioneers, a group of 28 inventors who worked for Thomas Edison. Lewis was considered an expert in electric lighting.
Why current is reduced if another resistor is connected in series?
Lets start with a very old analogy. Electricity flows through wire like water flows through a pipe.
That should give you a way to see this, the resistor resists the flow of electricity like a partially closed tap slows down water going into the sink.
Why transformers are called in MVA?
1. POWER TRANSFORMERS ARE "RATED" IN MEGAVOLT-AMPERES" NOT "CALLED" 2. SMALL TRAFO ARE RATED IN VOLT-AMPERE (VA) --- 0 TO 999 VA 3. DISTRIBUTION TRAFO ARE RATED KILOVOLT-AMPERE (KVA) --- 1000 TO 999,999 VA 4. POWER TRAFO ARE RATED MEGAVOLT-AMPERE (MVA) --- 1,000,000 VA UP POWER = VOLTAGE X AMPERES = VA POWER = VOLTAGE X AMPERES X P.F.(1) = VA IT IS NOT RATED IN WATTS/KILOWATTS/MEGAWATTS FOR THE LOAD IS NOT DEFINED FOR THE END USERS OR DESIGNERS AND THE POWER FACTOR IS ALSO UNKNOWN. TO BE SAFE, THEY USE 100% P.F. (UNITY) OR 1 FOR RESISTIVE LOAD THATS WHY THE RESULT IS ONLY VOLT-AMPERE. MOTOR OR INDUCTION LOAD ARE USUALLY LESS THAN 1.
What is amplitude demodulator?
(I am assuming you want to know what an "AM Demodulator" is, as follows) AM stands for Amplitude Modulation, perhaps the most basic kind of modulation of a radio carrier wave. Information, typically voice or music, is impressed on a radio carrier by simply varying the strength or 'amplitude' of the carrier (which is ordinarily at a much higher frequency than the information signal) versus time. An AM Demodulator, then, is a device which recovers the original signal, that is the voice or music, from the modulated carrier wave after it has been transmitted from the source to the receiver (which typically filters and amplifies the received signal before it is applied to the demodulator). The simplest AM Demodulator is a simple "diode", a 2 terminal semiconductor (or vacuum tube) device which, together with another filter, can convert the AM modulated carrier directly into the original form, discarding the carrier wave in the process. This is known as an "Envelope Detector". Other types of AM Demodulators exist, principally the "Product Detector". See the subtopic "AM Radio" in the Wikipedia entry for "Demodulation" for a little more information (it's not overly technical).
