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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 could be the tendencies for the voltmeter if the voltages to be measured exceed the range?
You'd potentially damage the meter. Whether you do or not is immaterial; if the meter cannot measure the range of voltages you are expecting, it will not give accurate readings over that voltage range, thus you should not use it. Buy a different meter that will measure over that voltage range, or use a voltage divider circuit to get a lower voltage at a certain ratio of what is actually in the circuit (this may be difficult to do, or very simple depending on the circuit tested - the key is you do not want to load the circuit with the voltage divider network).
If all the bulbs are connected in parallel, and there is enough current, yes, the brightness will be the same. The voltage (which is the amount of energy in every charge), remains the same for all bulbs
Electricity powers lots of things such as heating, cookers, light switches, and lots more!!!!!!!!!!!!!!!!!!!!
What is power factor when talking about electricity distribution?
Power factor is the ratio of real power over total power, where total power includes the vector sum of real and reactive power.
Resistors use real power. Perfect capacitors and inductors store power. In an AC system, capacitors and inductors will begin collecting power as the voltage applied to them increases, but eventually the voltage applied to them will be less than the charge they are already holding, and they will discharge into the circuit. This shows up as a phase shift in current relative to voltage.
What are the applications of ujt?
The simplest application of a UJT is as a relaxation oscillator, which is defined as one in which a capacitor is charged gradually and then discharged rapidly.
What is a difference between neutral earthing and body earthing?
here is no major difference between earthing and Grounding, both means "Connecting an electrical circuit or device to the Earth". This serves various purposes like to drain away unwanted currents, to provide a reference voltage for circuits needing one, to lead lightning away from delicate equipment. Even though there is a micro difference between grounding & earthing.
Earthing and Grounding both is refer to zero potential but the system connected to zero potential is differ than Equipment connected to zero potential .If a neutral point of a generator or transformer is connected to zero potential then it is known as grounding. At the same time if the body of the transformer or generator is connected to zero potential then it is known as earthing.
How can measure transformer KVA?
the capacity of a transformer is defined as a product of voltage and current flowing through it.AS THE CURRENT IS MEASURED IN AMPERES AND VOLTAGE IN VOLTS, Hence transformers are measured/rated in KVA
How can you get 25ohm total resistance from 100 resistors having 1 ohm resistance?
Connect 50 of them in series. This would have 50 ohm as equivalent. Same way have another 50 pieces in series. This again would have 50 ohm as effective value. Now connect these in parallel to each other. Now the effective would become as 25 ohm.
What do we actually measure for calculation of average value of a particular wave?
wht is the significant of RMS VALUES OF A PARTICULAR WAVE/
What is the Phase to neutral voltage on a 400 volt 3 phase power supply?
The line-to-neutral (not 'phase-to-neutral'!) voltage on a 400V 3-Phase wye-connected system is 230V.
Line voltage is the voltage as measured between any two (2) line conductors (hence its name!). Line voltage is often referred to as the 'line-to-line voltage'.
Phase voltage is the voltage as measured between any single line and neutral. Phase voltage is often referred to as a 'line-to-neutral' voltage.
"400V" on a 400V 3-Phase wye-connected power supply indicates its line voltage. Line voltage in a wye system is always the phase voltage multiplied by the square-root of "3" (1.732) and reflects the vector sum of two individual phase voltages present in a three phase system.
Thusly, if the line voltage is "400V", then the phase voltage is 400V divided by the square-root of "3" (1.732), which is 230V.
Examples of this for North American power systems are 120/208V, 277/480V and 347/600V. Examples for other areas of the world are 220/380V, 230/400V and 240/415V.
- von Neumann machines are based on the processing/memory abstraction of human information processing.
- neural networks are based on the parallel architecture of animal brains.
Neural networks are a form of multiprocessor computer system, with
- simple processing elements
- a high degree of interconnection
- simple scalar messages
- adaptive interaction between elements
A biological neuron may have as many as 10,000 different inputs, and may send its output (the presence or absence of a short-duration spike) to many other neurons. Neurons are wired up in a 3-dimensional pattern.
Real brains, however, are orders of magnitude more complex than any artificial neural network so far considered.
Where can neural network systems help?
- where we can't formulate an algorithmic solution.
- where we can get lots of examples of the behavior we require.
- where we need to pick out the structure from existing data.
by omiyehan Sunday
What size generator for 1600 amps three phase supply?
copper wire diameter,length and numbers of turns for 20 micro Henry inductance and 1600 Amp current
A mv is a millivolt, though Voltaire was a human so its is correctly spelled mV with a capital V.
a kw is a kiloWatt. Watt was also a human so give his name a capital letter like this kW.
The two measures are not related. No amount of mV can be equal, or not equal, to a kW.
Volts are a measure of electrical pressure, to put it simply, and Watts are a measure of the energy (Joules) released in one second from something.
Possibly you have asked the right question.
How many AMPs does a 7.5HP motor need?
depending on 1phase or 3phase voltage motor , the amphere requirement is found out
for 3phase AC motor use this formula: (HP x 746)/(1.73 x E x Eff x PF)
for 1phase AC motor : (HP x 746) / (E x Eff x PF)
Diagram of star-delta connection of motor?
Unfortunately, WikiAnswers does not support graphic images, so I will have to describe the connection in words.
There are three windings, each with two wires. That is six connections. There are four connections in a star (wye) source, three hots and a neutral.
The star connection has one end of all three windings connected (together) to neutral and the other ends connected to each hot.
The delta connection has each winding connected end-to-end to each other in a ring, and each common point is connected to a hot. Neutral is not used in delta.
How do you check amps with a mutimeter?
First be sure to have it on, And on the 12volt setting (if selectable) Be sure to get a good grounding point, I.E, door hinge, Seat bolt, Batt ground, Then just touch the other end (Red) to the point your testing volts. It should then give you your reading, Just be sure not to confuse the wires, Damage your testing unit or worse, Short cars wiring. Hope that helps!
Answer 2:
An ammeter needs to be connected in series with your circuit, (that is, all current must "check in" at the ammeter). Many ammeters are called multimeters because they are both ammeters (measuring current) and voltmeters (measuring voltage). many people make the mistake of setting the multimeter up such that it is reading voltage when they desire to read current.
When a voltmeter is hooked up in series with a circuit, the fuse within the voltmeter may break, sufficiently pissing off any lab instructor you may be working under.
Why motor is taking high current and getting trip?
It is overloaded.
take the motor loose and see if it runs normally
if its on a machine that used to work check
bearings
misalignment
bent shafts
What is the voltage of British rail overhead lines?
On the main railway network, overhead lines use 25kV AC. In the past, some lines used 1500V dc overhead and 6.25kV ac overhead as well, but these have all been closed or converted. Tram and light rail systems use other systems.
How do Watts and Amps compare?
They don't as they a entirely different units that measure different things:
- watts are a unit of power (work done per second)
- amperes are a unit of current flow (electrical charge moved past a given point per second)
How is Circuit Breakers trip by Relays?
One common method (used for more than just differential relays) is to have a contact in series with one of the breaker trip coils, with this arrangement connected to a battery or AC power source. When the relay trips, the contact closes and current is allowed to flow through the trip coil, tripping the breaker.
Some relays are self powered, and will use a capacitor to provide the current to the coil instead of a battery bank or AC power source.
Differential relays often indirectly trip the associated breakers through a lockout relay. The differential relay trips the lockout, which has many contacts that close, tripping multiple breakers.
What is Resistance of 20 ohms and 10 ohms?
Well, the total circuit resistance depends on the type of connection.
If the two resistances (or any number of resistances) are connected in series, IE. one resistance end is connected to one end of another resistance, the the circuit total resistance is the sum of the two resistances. say two resistances r1 and r2 are connected in series the total resistance is r1+r2 (in this case its 30 ohms).
If the resistances are connected in parallel IE. both the ends of a resistance are connected to both ends of another resistance then the total resistance in this case shall be (r1*r2)/(r1+r2) ,( that is 6.67 ohms in given case).
Can a single phase 220 motor run backwards?
Changing motor rotation
A split phase induction motor has two sets of coils and a centrifugal start switch. The start winding is in series with the start switch. The start winding provides a rotating magnetic field in one direction enabling the motor to start. The motor can be reversed by reversing the connections of either the start winding or the run winding but not both.
Does the electrical service drip loop prevent a short to the grounding rod?
Drip loops prevent water from following the electrical service conductor into the service panel, causing shorts and other dangerous situations. So long as the low point in the cable is below the main lugs, water will collect and drip from there, and not continue to the exposed live parts of the panel. We usually have a drip loop in a place right next to the place the conductor penetrates into the head or the place where it "goes through" a wall or barrier. That way there is only a short "uphill" run between the drip loop and the penetration point for the conductor.
If the current in a 75 watt light is 6250mA then what is this in amperes?
Watts and amps measure different aspects of electricity and are not interchangeable.
How do you levitate a substance using earths magnetic field?
You can't make a magnet with only one pole. Every magnet, whether natural or
electro- , has two opposite poles. One pole is attracted to Earth's north magnetic
pole and repelled by Earth's south magnetic pole. The other one is attracted to
Earth's south magnetic pole and repelled by Earth's north magnetic pole.
For the same reason, there's no such thing as "repel Earth's magnetic field"
because Earth itself is a giant magnet, and also has two poles. One of them
attracts one end of any magnet, and the other one repels one end of any
magnet.
Make any electromagnet you like, and figure out a way to hang it up and let
it turn freely. It'll line up with its ends pointing to the Earth's north and south
magnetic poles.
