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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
How do you use electric power in inductive load?
The actual energy consumed in load is inductive load
How does speed affects the generated emf in a self-excited generator?
to start a self excited generator you must remove the load
the residual magnetism is the excitation
starting with a load demagnetizes the all the iron
dc generators are designed to have full field at operating voltage
so voltage is constant over a pretty wide range of speeds
ac can have permanent magnet embedded the shunt feild in the rotor keeps the voltage constant of course the frequency varies with rpm
in gold mining you have 2 types of deposits. a placer deposit is gold that has eroded from a vein and been redeposited by water in a stream or river. a load deposit is gold still in place in the vein.when miners would find gold in a stream they would search for the load or vein that produced the placer deposit.since the load was where the gold came from its reffered to as the mother load.
In a series connection if one component fails the whole circuit fails?
Yes. Open circuit.
A: It depends on the failure type a short will not necessarily make an open circuit but rather a non functional circuit.
What is a condition that provides an undesired path for electrical current?
The condition you are looking for is a short circuit.
Does a transformer draw a lot of current when first connected to a source?
Yes it does as it is an Inductor and an Inductor needs to build up a magnetic field. It is called INRUSH current.
How do you wire star delta motor having no labels of wires?
You can't , without knowing which winding is which . 9 times out of 10 it will just trip your protection device if it's connected wrong . U need to watch for it starting i'n forward i'n star but when it kicks into delta goes i'n reverse . If u take the motor to a winding shop they should be able to identifie which winding is which .
A kV.A.h (not 'kvah') is a kilovolt ampere hour. You can think of it as being the vector sum of 'active' (kW.h) and 'reactive' (kvar.h) energies.
What is the difference between AC and DC in terms of oscilloscope?
One is sinusoidal through the zero point i.e. alternating current, the other would be a flat line at whatever the current value was i.e. direct current
If I'm understanding the question, you are proposing using one motor and one generator, and have the motor spin the generator up to speed, and have the generator attempt to supply power to the motor.
The answer is yes, you can do this, but you will be losing energy, not gaining it. The motor and generator's efficiencies are less than 100%, so once you remove the outside source they will slow down until they come to a complete stope, without any other load connected other than themselves.
How do you calculate multiplying factor in 3 phase kwh meter using ct ratio is 600VA 5 class 5.0?
The question is incomplete, because there are no mention about CT & PT ratios. 600VA 5 can not be CT ratio.
What affect does a leading power factor have on alternator generator excitation currents?
When a leading power factor load is applied, the voltage of the genset or genset bus rises, and the voltage regulation system reduces exciter power, reducing the strength of the magnetic field. If the field fails, the generator set may slip a pole, which results in potentially catastrophic alternator damage. pawan
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How do you stop a maglev train?
The current flow is reversed in the opposite direction, which causes a retardation in the speed of the train.
MagLev trains use the rule that like poles of magnets repel to stop. So, the electromagnetic track just changes so that all the South and North poles all meet other South and North poles and the train is repelled, slowing it down. They balance it out, and the train is stopped.
What is the Difference between Si and Ge diodes?
The significant operational difference between a Si diode and a Ge diode is that Si diodes have a knee voltage of 0.7V needed to allow current flow and Ge diodes have an operational voltage of 0.3V to allow current flow.
What is the foremula running amps to full load amps?
There is no formula needed, they are the same thing, just two different wordings.
Do televisions use single-phase or 3-phase power?
Answer 1:
TV's use single-phase power.
Answer 2:
TV's use single phase power of 220 or 110 volts ac power depending on what part of the world you live in.
What is a 20 amp Type B miniature circuit breaker or mcb?
It is a miniature electrical circuit breaker designed to protect a circuit that normally carries up to 20 amps of current.
The following information was taken from the Related linkshown below. * Type B devices are generally suitable for domestic applications. They may also be used in light commercial applications where switching surges are low or non-existent. * Type C devices are the normal choice for commercial and industrial applications where fluorescent lighting, motors etc. are in use. * Type D devices have more limited applications, normally in industrial use where high inrush currents may be expected. Examples include large battery charging systems, winding motors, transformers, X-ray machines and some types of discharge lighting. The classification of Types B, C or D is based on the fault current rating at which magnetic operation occurs to provide short time protection (typically less than 100ms) against short-circuits. It is important that equipment having high inrush currents should not cause the circuit-breaker to trip unnecessarily, and yet the device should trip in the event of a short-circuit current that could damage the circuit cables. They have different fault current tolerances and tripping characteristics:
* Type B devices are designed to trip at fault currents of 3-5 times rated current (In). For example a 10A device will trip at 30-50A. * Type C devices are designed to trip at 5-10 times In (50-100A for a 10A device). * Type D devices are designed to trip at 10-20 times In (100-200A for a 10A device).
For more information about MCBs and related topics such as ELCBs, GFCIs and RCDs, see the answers to the Related Questions and the Related Link shown below this answer.
What is the function of a braided wire?
A braided wire is less likely to break than a solid wire. Also it can bend sharp corners easier than solid wire.
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The use of braided wire is to act as a shield on analog cable sets. The braid can be 50%, 75% or 100% shielding. The braid is grounded only at one end so as not to conduct a current through mutual inductance from other wires. Its function is to protect the signal wires in its cable from magnetic interference from adjacent non shielded cables. The wires inside the shielded cable are stranded where as the braided shield is very fine solid wire woven together to form a shield over the entire cable set. Another example of a braided wire would be a coaxial cable.
Can you use a 6 volt relay to 230 volt circuit?
If you are talking about a 6 volt coil, yes, so long as the contacts are rated for the 230 volt circuit.
If you are talking about 6 volt contacts, no, absolutely not.
Resistance in the length of wire that makes up the extension cord causes voltage to drop. But it needn't be a problem with the right extension cord. For an electric drill, up to a 25 foot cord of 16 gauge wire will cause a voltage drop so small as to be negligible. For 50 feet, switch to a 14 gauge cord. For heavier power tools (circular saw in particular) you should use a 14 gauge extension from the get-go.
How much current is present when one coloumb of charge passes through a conductor in one minute?
Since current in amperes is defined as one coulomb per second, then passing one coulomb through a conductor in one minute consitututes a current of one sixtieth of an ampere, or 16 2/3 milliamperes.
Can you cut and shorten a parallel connected string of lights?
A: Sure even to a one to one level. The problem will become evident when the power will increase linearly as the load evidently is increased by cutting and shortening that is true if the input power level remains the same
What are the volts per phase on a 240 volt system?
By 'volts per phase', I assume you mean 'phase voltage' as opposed to 'line voltage'?
It depends on the country in which you live. In North America, for example, the secondary output of a three-phase distribution transformer typically delta connected, 240 V corresponds to both the phase and line voltages.
In other countries, where a three-phase distribution transformer's secondary is wye connected, 240 V is typically a phase voltage and 415 V is a line voltage.
