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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
Where can I buy a synchronous motor TYC50?
You can purchase a synchronous motor TYC50 from various online retailers such as Amazon, eBay, or AliExpress. Additionally, you can also check with local electronics stores or specialized motor suppliers for availability.
What conductor should be grounded in a four wire three phase system?
The neutral conductor is typically grounded in a four-wire three-phase system to provide a path for fault currents to return to the source and to stabilize the system voltage. Grounding the neutral also helps to protect equipment and personnel from electrical hazards.
Why switch is always connected in the phase wire?
First of all, the correct term is 'line' and not'phase' wire. The reason a switch is always placed in the line conductor, rather than in the neutral conductor, is that its function is not simply to break the circuit, but also to ensure that the circuit's load is disconnected from the line potential. If the switch were to be placed in the neutral conductor, it would still break the circuit, but the load will still be at line potential and present a shock hazard to anyone attempting to work on the load (e.g. to remove a lamp from its holder).
How the input voltage is changed to an output voltage in a transformer?
Transformers work on the induction principal of the flux of the primary winding cutting the wires of the secondary winding. The amount of turns in the primary in relationship to the amount of turns in the secondary is the transformers winding ratio. This ratio is what governs the voltage value of the secondary winding.
How much current will a 7.5 hp 1 phase 220v motor pull?
First we convert horsepower to watts. 1 Horsepower equals 745.7 watts. Next, using the Ohm's law formula P=IxE where P is power measured in watts; I is current measured in amps; E is voltage measured in volts.
Therefore
5(745.7) / 240 = 15.5 amps
<<>> The current taken by a motor is highly variable depending on efficiency, power factor and the mechanical load. On a 240 v system you should allow 7 amps per HP. So for 5 HP you should allow 35 amps.
Since 2-phase systems went out of use 100 years ago you probably have a single-phase motor which has two suppy wires, a live and a neutral, plus probably an earth wire.
What size breaker for a 208 volt single phase motor that pulls 1.4 amps?
208 volts is not a common single phase voltage but you could just size your breaker to the capabilities of the conductor. 208 is normally a phase to phase voltage
<<>>
Many 230 volt motors can be connected to lower voltage supplies. These motors can be connected to supplies of 208 and 200 volts. The code requirement is that the 230 volt full load amperage of the motor be increased by 10% and 15% respectively for wire sizing and breaker selection. To answer the question you will need a two pole 15 amp breaker.
How many people will 1 megawatt of power service?
This is very dependent on the society concerned, but I guess you mean in a developed industrial society such as the US or Europe, and again whether you mean average or maximum demand per house.
Making it simple, the average demand per house is about 2 Kw, so 1 Mw will supply 500 houses. However if all those houses were cooking their Christmas (or Thanksgiving) turkeys at the same time, this could easily rise to 5 Kw per house, and more if electric heating is in use. Spare a thought for the power station staff keeping it all going!
What is the difference between single and three phase on line UPS?
The difference between a single and a three phase online UPS is a 3 phase can supply a 100% unbalanced load on its output without affecting its performance. A single phase cannot supply a 100% unbalanced load on the output without affecting its performance.
How amount of electrical current that can flow through a circuit depends on what?
The potential difference (voltage) between the ends of the branch, and the
resistance of the branch.
In a simple parallel circuit, the voltage is usually the full power supply, so the
main thing to note is that none of the other parallel branches has any influence
on the current through the parallel branch of interest.
Force on a current-carrying conductor?
When a current-carrying conductor is placed in a magnetic field, a force is exerted on the conductor due to the interaction between the magnetic field and the current. This force is known as the magnetic Lorentz force and its direction is perpendicular to both the magnetic field and the current flow. The magnitude of the force depends on the strength of the magnetic field, the current flowing through the conductor, and the length of the conductor exposed to the magnetic field.
A 6-volt battery produces a current of 0.5 amps what is the power in the circuit?
The power in the circuit can be calculated using the formula P = V x I, where P is power, V is voltage, and I is current. In this case, the voltage is 6 volts and the current is 0.5 amps, so the power in the circuit would be 3 watts (6 volts x 0.5 amps = 3 watts).
What items of equipment should be used to test if the electrical circuit is live?
The most important piece of electrical safety equipment that is used in the electrical trade is a voltage detector. You never start or do anything to a circuit until the circuit is tested and confirmed de energized. Once the circuit is confirmed de energized pad lock it in the off position and keep the key on your person. Never ever take any ones word for it that the circuit is turned off. Get the meter out and confirm that the circuit is de energized for yourself.
Probably not. It would depend on several factors. I would expect that the filament resistance is somewhat dependent on temperature. So if you had a longer duty cycle between switching events the filament would cool down more and perhaps have less resistance. Theoretically if you had a temperature controlled resistance and could do perfect switching then you could probably get it to where the power usage was the same.
What is the strength of a power source that is measured in volts?
Volts is actually the measure of the difference in POTENTIAL. It is also called Electro-Motive Force, or EMF. This is important because between two conductors of equal potential (same phase, same voltage to ground) you get a reading of 0 volts. That doesn't mean there isn't power there. There may be a lot of potential in each conductor in fact, just not between the two. That's why when testing a circuit you have to test it with a KNOWN POTENTIAL, such as a ground you know is properly grounded.
Practical applications are: There is no difference in potential between a hot wire and a plastic box, or between it and itself or a wire from the same phase. There is no difference between a hot wire and a wood floor (usually) such as in a house. This is how electricians learn how to handle hot wires and not get hurt.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized
IF YOU ARE NOT REALLY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
How does a series regulator maintain the output voltage at a constant level?
A series regulator maintains output voltage by adjusting its resistance to compensate for changes in input voltage or load current. It compares the output voltage to a reference voltage and regulates the voltage by adjusting the series pass device to ensure the output remains constant. This feedback loop continuously monitors and adjusts the output voltage, providing a stable output despite variations in input or load.
How do you convert 208 v 2160 Amperes to KVA?
To convert amps to kVA, you use the following formula:
Amps = (kVA x 1000 / voltage) / 1.73
Where might a step-up transformer be used?
Determine the type you need (primary voltage, secondary voltage, power rating in volt amperes - not watts, size, etc.) then check a catalog at an electrical or electronics parts store for a standard transformer meeting your requirements. If you find one and the store stocks it, buy it; if not have them order it for you.
If there is no standard transformer meeting your requirements, one would have to have a company that custom winds transformers design and build it for you. Unless you would be buying in quantity, this will be expensive.
What are grounded electric circuits?
A circuit is electrically grounded when charges are able to flow directly from the circuit into Earth in the event of a short circuit.
AnswerYou are probably thinking about what is called a 'chassis ground' or 'chassis earth'. Cars' electrical systems are examples chassis ground systems.
Using a car as an example, one terminal of the battery (usually the negative terminal) is connected directly to the metal body (the 'chassis') of the vehicle. The other terminal then supplies the various electrical loads in the car. An individual circuit consists of a single insulated cable running, via a switch, to, say, a headlamp; the return part of the circuit is then through the metal bodywork of the car. So the car's bodywork acts as the return conductor to the battery. Using a chassis earth dramatically reduces the number of conductors required by all the various loads within a car, as the chassis of the vehicle acts as the return conductor for each circuit.
A chassis ground may, or may not, be itself connected to the general mass of the earth itself. In the case of a car, the chassis earth is not connected to the earth itself.
In most other cases, ground or earth connections are made between the metal housing of an electrical appliance and the general mass of the earth itself. In the event of a line conductor accidentally making contact with the housing of an appliance, an earth fault is applied to that circuit, causing the fuse or circuit breaker supplying that circuit, to trip. In other words, the purpose of this type of earth connection is to protect against a shock hazard. The reason this sort of protection is necessary is because the supply transformer's neutral is grounded at the substation, and offers an alternative route for a fault current to return to the source.
Why resistance of alloys decreases with temperature?
The decrease in resistance of alloys with temperature occurs because as temperature increases, the atoms within the alloy vibrate more vigorously, causing increased collisions between electrons and atoms. This increased atomic movement disrupts the orderly flow of electrons, leading to a higher resistance.
What is the difference between alpha DC and beta DC?
Alpha direct current (DC) is the current consumed by electrical equipment when they are idle or in standby mode, while beta DC is the current consumed by electrical equipment during their operation. Alpha DC is also known as standby power consumption, whereas beta DC is related to the active power consumption of the device.
Why slip ring induction motor rotor failure occurs?
while running, a slip ring induction motor ,it got tripped and found 2 nos power fuses blown out.on inspection rotor winding IR value zero.ie after releasing the brushes. how it happens?. pl ans
when the motor is starting its an induction motor with a squirrel cage
while its getting up to speed the voltage across the slip rings will be very high
there is a field resister shorting the rings this is removed and replaced with dc
with a make before break field application relay
if the dc is applied before the motor is up to near synchronous speed the stator will need to have very high current to accelerate the mass of the machine
sometimes the controls are magnetic
sometimes a centrifugal switch
sometimes a timer
a compressor will have an unloader to minimise load on the motor before the dc is applied
however this is done
if dc is on the field before you get close to operating speed you will blow fuses
if the "failure" happened while running it could be a momentary power interruption or a momentary load interruption
if the controls didnt see it and restart the motor
you can dissect the fuses and see weather you had a short or an overload
or add a bit more detail about the equipment and incident
What is the main function of a miniature circuit breaker?
Miniature circuit breakers or MCBs are used to replace fuses that protect individual pieces of electrical equipment and the circuits which supply them with power.
In the case of tripping because of a current overload, MCBs are very easy to reset, which is much simpler to do that having to replace blown fuses. MCBs also trip to stop the current from flowing much faster than fuses can operate.
However MCBs are not better than fuses in all respects: MCBs are much more expensive than fuses and they take up more space, which is why fuses are still used for some applications.
To convert 15 amps at 415 volts to kilowatts, use the formula: kW = (amps x volts) / 1000. So, kW = (15 A x 415 V) / 1000 = 6.225 kW.
How does a star winding shifts to a delta winding in a three phase motor?
To shift from a star winding to a delta winding in a three-phase motor, the connections between the windings need to be rearranged. In a star winding, the ends of the windings are connected to a common point (neutral), while in a delta winding, each winding end is connected to the start of the next winding. By physically switching the connections, the motor can be reconfigured from star to delta winding.
True or False - The primary job of the distributor is to convert low voltage to high voltage?
False. The primary job of the distributor is to transport electricity from the transmission system to the distribution system and then deliver it to end users at lower voltages. The conversion of voltage levels is typically done by transformers at substations, not by the distributor.
