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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
Is it possible to reset the digital electric meter?
yes
put it in your friends' microwave oven on HIGH for about 3 seconds +/-2 Sec.. pull out with gloves and replace in to receptacle.
What is the temperature class PU?
As per API 6A temperature classification, -20 deg F to 250 deg F operating temperature range.
Moving out at age 16 Minnesota?
The age of majority in Minnesota is 18 years and there is no provision in the law for emancipation of minors.
See below link:
What happens to your aquarium if the electrical power goes out?
As long as the power is not out for more than a few hours there should be no problems.
A lot depends on the size, number of fish, etc of the tank. The problem is the air-ation system and to a lesser degree, heat and filtration.
If the power is off for any period...stir the water, especially bottom to top, every so often. See, the bubbler itself DOES NOT actually aerate the water...it simply makes the water move and the air comes in through the water exposed on the top. Move the water manually to get a similar result.
Heat and filtration are not normally problems for some time...but if it is going to be long...improvise...including preventing heat loss...and maybe getting a syphone system running through some filter.
What is difference between transformer and center taped transformer?
Not a big difference, an ordinary transformer only have one voltage out for instance 12 Volt, where a center tap can supply two X 6V with the center tap as 0 volt and 12V it is normally called a 6-0-6 or 9-0-9 an advantage of the center tap is that you only need two diodes to get full wave rectifying where with a ordinary you will need a full bridge to get full wave rectifying
Can each branch in a parallel circuit may hold several resistors?
Yes, but then it would be a 'series-parallel' circuit, not a 'parallel' circuit!
What is defrential protection relay?
I am going to assume that you are asking about a differential relay. It is basically just that- it compare two different sources and will trip at a set value value of the difference. These can be directional as well. A couple of examples are transformer protective relays and bus differential. A transformer relay will measure the amount of current coming into the transformer and the amount of current going out. If there is a disparity due to an internal fault the relay will trip the supply source and deenergize the transformer. Same for the Bus differential.
Can i Over load an oil filled transformer?
Any transformer can be overloaded by applying a load above the capacity rating of the transformer.
Why might the amount of current and voltage in a circuit need to be balanced?
It is not so much the voltage that has to be watched but the amperage. On a split phase secondary 120/240 volts or a neutral of a three phase wye connection 120/208 volts the neutral carries the unbalanced current from the connected loads.
To keep this unbalanced current down to a minimum the load breakers have to be shifted around in the distribution panel. The object is to balance the connected loads so that the neutral will carry minimum load. Depending on where in the distribution panel the breakers are positioned will result in what the current on the panels neutral will draw.
The general procedure for electricians is to place a clamp on amp meter on the distribution panels neutral and write down what the amperage draw is on a fully loaded distribution panel.
Then take readings on the individual loads of the circuit amperages and mark them down on a piece of paper.
Once all of the loads have been read try and put the closest load amperages across from one another.
Once all of the balancing has been done use the amp meter on the panels main neutral conductor and see how much lower the reading is now as to what it was at the beginning of the exercise.
This is known in the electrical trade as balancing the distribution panel.
With this in mind the electrical code book allows for the use of reduced neutral conductor sizing as compared to the size needed for the main feeder conductors. This in turn reduces the installation costs of a service distribution system
On reduced neutral distributions, this is why the amperage is to be kept to the lowest possible rating so as not to overload the smaller conductor size used for the distribution's neutral.
What determines the amount of potential required to forward bias a unijunction transistor?
Intrinsic Stand-off Ratio
Why we don't use starters for small motors?
When motor is started it has low speed which does not produce back emf hence very large current is drawn by the motor which may destroy the coil inside.small motors gain speed very quickly they produce back emf very fast at start hence they do not require starter.
Which type of electrical motor is used in room clenar?
Vacuum cleaners require a high power to weight ratio in the motor and for that reason a commutator motor is used although the lifetime is relatively short for this type of motor before the brushes need replacing.
How may the direction of current flow in an armature be determined?
Just like reading a book. Left to right, up to down.
This circuitry is already in the market place. It is in the form of an ATS (automatic transfer switch). The controller is pre programmed for sensing and switching. Customer input is limited to setting of the timing of the relays in the transfer switch.
What is the line current of a 3 phase 63kw 277 480 vac trasformer?
If the load is balanced across all three phases, and the power factor is 1.0, the line current would be about 76 amps at full load. For a more typical power factor of 0.85, the current would be closer to 89 amps.
What Happens When an AC of 5A and dc current of 5A flow simultaneously through a circuit?
it will be the polarized sum of the two quantity
This looks like a question from a student's coursework. It is impossible to answer without seeing the diagram or Figure 20-37, as is stated in the question.
The actual diagram is needed to show which components are in parallel and which are in series.
If you want someone else to do your homework for you, you will either have to find out how to attach a Related Link to this question, going to a separate web page which shows the diagram, or - much better - read your course materials and answer this question all by yourself. Doing the work yourself is the only way to really learn this technical stuff!
Where is the ignition power transistor on a 94 dodge colt?
most likely it will be on the drivers side right up against the fire wall
It is better to use AC. Impedance of the capacitor depends upon the frequency of the input signal. If we apply DC input signal than f = 0, that means Z approaches to infinity. If you apply the DC input signal then the current shall flow only for the time the capacitor is not charged. As the capacitor is charged current flow stops. At this point it is almost impossible to measure the voltage across capacitors because as you apply voltmeter across the capacitors, capacitors start to discharge through voltmeter (at this stage input impedance of the voltmeter is less as compared to that of capacitor).
So if you use AC then this situation does not occur, moreover you can control the impedance of the capacitor by varying the frequency of the input signal.
Regards
Muhammad Bilal Saif
If you have any further questions you can contact me at bilal_saif@giki.edu.pk
What is the rank of SUNY-Buffalo for Ms in Electrical Engineering?
68 according to US News. But should in fact be ranked much higher, given the quality of the Professors. I believe it should be easily in the top 50.
A changing magnetic field generates an electric field and alternating currents are accompanied (or caused) by alternating voltages.
Will AC power tools run on a DC generator?
If the power tool has brushes to bring the current to the armature it is classed as an universal motor. It will run on DC as long as the voltage is the same potential. On a welding machine the 120 volt receptacle is a DC output and the grinders, drills, etc that are plugged into it work fine.
What are the applications of wireless communication?
mobile telephones
voice communications
wireless energy transfer
wireless data communications
cost effective
Voltage is defined as potential difference (units of volts).
Work is equivalent to power (over time), and its' unit is joules. Power is equivalent to the potential difference times the current flow. Without current flow, there is no power, so it is incorrect to define potential difference as work.
What I think you're implying is potential energy and potential difference are the same:
Potential energy of a rock can be increased by raising the rock into the air. The increase of potential energy of the rock is equivalent to the real work done to raise it higher into the air. This is a true statement.
Potential energy (joules) and potential difference (volts) are not equivalent, though, since potential differenence is not defined as work.
