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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 is an interrupting rating on a fuse?
It should have a code identifying what kind of fuse it is, which can be looked up.
While Voltage and Resistance typically remain constant in incandescent lamps: P (Power in Watts) = I (Current in Amperes) times E (Electrostatic energy in Volts [AC and DC]).
P=I*E - when P (Watts) goes up so does I (Amps).
What is the difference between a circuit board and an intergrated circuit?
A cicuit board is a board made of plastic and metal interconnections where the various electronic devices are assembled in discrete form to make up the circuit.In an integrated circuit a semiconductor chip is so processed such that the various electronic devices and components are directly grown on it.
How can Ohm law be used to calculate the electrical resistance of a piece of wire?
Ohm's law establishes the relationship between the current flowing in a conductor (represented by I), the potential difference across the two ends of the conductor (represented by P), and the resistance offered by the conductor (represented by R) through which current is flowing. Thus, general Ohm's law calculations based on only Ohm's law involve finding one of the three quantities.
AnswerWhile you can always use the ratio of voltage to current to determine the resistance of the wire, there is no guarantee that the wire is obeying Ohm's Law!
This is because Ohm's Law only applies when the ratio of voltage to current is constant for variations in voltage. For example, Ohm's Law doesn't apply to tungsten wire, because its resistance changes markedly for variations in voltage.
There is a general misunderstanding of Ohm's Law that it applies to all materials. This is not true, as it only applies to 'linear' or 'ohmic' materials.
What is current capacity of 1200kva genarator?
The current rating of a 16 kV.A (not 'kva') depends upon the voltage rating of that generator, with 16 kV.A being the product of the rated current and the rated voltage.
Where is the fuse box on an 89 Grand Marquis?
It is under the steering column on the left side behind the plate that covers the bottom half under the steering column, two screws on the bottom of the plate will remove the plate, then yoiu have to remove the adjuster for the right side mirror
Why is important for three phase supply voltage to be in-phase?
The phase voltages (i.e. line-to-neutral in a 4-wire system, or line-to-line in a 3-wire system) of a three-phase system are displaced from each other by 120 electrical degrees. Each phase voltage, in fact, is rarely in phase with its phase current, as the phase-angle (the angle by which a phase current lags or leads its phase voltage) is determined by the load not by the supply.
In general, most loads are resistive-inductive so the phase current usually lags the phase current.
So, to answer your question, it's not important that a phase current is in phase with its phase voltage -if that is what you are asking.
How do you check a ground fault interrupter?
There is only 2 forms of Ground fault protection. A breaker or a recptacle (stadard plugs and outlets). Both are obvious to the naked eye. A recptacle will have a test and reset button that will turn it on and off. This is a sensor that constantly monitors the diffence of potential between the HOT wire and the grounded conductor . If this gets to and unacceptable limit It will trip. The breaker will have a test and reset button next to the switch. The complicated part is that 1 GFI outlet can protect multiple outlets. When it is hooked up it has an option to Downstream other outlets. Theese outlets are then monitored by the same sensor in parralel with the first. The best way is to push the test button and check for outlets that shut of with the GFI. Code requires a GFI protected outlets to have a sticker on it stating that fact. A breaker wll protect the entire circiut from ground faults provided it is hooked up correctly.
Does increasing the resistance increase the electric current?
If the current through a pure metallic conductor causes the temperature of that conductor to rise, then its resistance will increase. A practical example of this is an electric lamp. The cold resistance of a lamp is very much lower than the hot resistance.
Why to choose electrical engineering?
We live in a world that is controlled by electronics. We live in a world where we eat, breathe, and sleep electronics. We love electronics in this day and age. Picking a career in electrical engineering is a great way to ensure that you will have a job in the future. It is unlikely that we will use less electricity and electronics in the future. Also, you get to apply physics and math to better humanities quality of life. If you enjoy math and physics but also want to see what you design become something real, engineering is a great choice. You will also get to learn about electricity, magnetism, material science, physics, chemistry, computer programming, and advanced math. Because you are exposed to so many different classes, you may find something you like even more. The diversity of the training program will give you the opportunity to explore your talents and interests. I seriously recommend engineering or even physics. After you take them, you see the world differently. You understand the world and what goes on around you. It is a wonderful feeling to use a computer and know how it works all the way from the operating system to the logic gates, to the Silicon in their field effect transistors,down to their valence electrons excited to the conduction band, and then all the way down to their energy levels and quantum behavior. See? You'll love it if you love to know how the world works.
Source:
An electrical engineering graduate student.
P.S. I was bad at math, so if you are too, don't let it discourage you. You will get better and it will be more fun when you're applying it. Take linear algebra too, very early on, it helps a lot.
Why is an ammeter is always connected in series with the circuit?
When considering electricity,
Current (measured in Amps) is often considered the flow of energy.
The force behind the flow is the Volts.
While the volts can be measured between any two points in the circuit (open, or closed), measuring the current, or flow of energy typically requires interrupting the flow.
Somewhat like water. One can measure pressure of the water on a branch, but one must have a way to monitor the actual flow to determine how much water has passed.
There are "exceptions" though.
If you have an AC circuit, then an inductive ammeter can measure the amps around a single leg if the circuit without being installed inline with the circuit.
Even with a DC circuit, it may be desirable to design a bypass or shunt circuit so that the majority of the current bypasses the ammeter, and only a small amount of the current actually flows through the ammeter.
Who is the most powerful transformer ever other than unicron and primus?
well there was never any real proof but a heres a few. Comic galvatron can nuke planets and somtimes even galaxys in 1 shot. powermaster optimus prime is stronger than him even without apex armor his apex armor would make him much more powerfull essecilly with all of god ginrais god powers and element controll and the power of a supreme god and a matrix more powerfull than the sun. metroplex was atleast thosends of feet tall he lfted a mouten with 1 arm fortress maximus is bigger than him. (and sometimes super ginrai is the smae size a him). fortress maximus has photon cannons to. devestator while damaged lifed 600 million pounds with 1 arm. star saber has much more power than god ginrai and victory saber surpasses even him. dai atlas with the zodaic is strong to. but other than unicron and primus it would either be engergon optimus prime (he beat unicron but that was with the power of primus and stuff) it would be star convoy he has all of the zodaic power he has the power of the big bang itself
What kind of output current comes in the generator?
Direct current is simply a by-product of the generating process. It simply means the current travels in one polarity, where as AC, or alternating current changes polarity at a constant rate. (60 hertz in the US)
What are the parts to progressive overload principle?
The progressive overload principle is all about working your body harder than what you would normaly would so that you are putting enough stress on the body to make improvements but its about finding the right intensity so that you do not sustain any injuries.
In an eight across the line AC reversing motor control setup, typically two mainline contractors are used: one for the forward direction and another for the reverse direction. Each contractor controls the power supply to the motor in its respective direction. Additional components, like overload relays and control relays, may also be included in the assembly for protection and control functions.
What is the useful of open end winding of induction motor?
Standard induction motor has a closed squirrel cage rotor, where as open ended induction motor has split phase rotor.
Yes. Ohm's law is generally thought of as a basic law of electricity, but electricity is, in the language of physics, a part of the electromagnetic force. The electromagnetic force is one of the four basic forces in the universe (allong with gravity, the strong force (called the strong interaction) and the weak force (called the weak interaction). That's the electromagneticforce. Not the electric force or the magnetic force, but the electromagnetic force. And Ohm's law is a most fundamental expression of the relationship of voltage, resistance and current in an electrical circuit. In that light, Ohm's law is a general law of the electromagnetic force. Note: Some science teachers might try to split hairs here and say that Ohm's law is an electrical law and not an electromagnetic law, but this is one of those questions that might be said to have two answers. As regards what was said in the first paragraph, nothing in it is incorrect. Nothing at all.
Another Answer
Absolutely NOT! For Ohm's Law to be valid, the ratio of a circuit's voltage to current must be constant for variations in voltage. In other words, if you were to plot current against voltage for variations in voltage, you should end up with a straight-line graph. In fact, this is rarely the case. In most cases, you will end up with a curved line which confirms Ohm's Law does NOT apply.
Most materials and electronic devices (diodes, etc.) are classified as being 'non linear' or 'non-ohmic', meaning they DO NOT OBEY OHM'S LAW.
So Ohm's Law is most certainly NOT a universal law and, in fact, barely qualifies as being a law at all!
How do you connect surge arrester?
The surge arrestor is clipped onto the rail in the DB next to the existing breakers, the live (red) wire is looped from the existing live loops above the other circuit breakers onto the top of the surge arrestor. The bottom of the arrestor is connected to the earth bar. It would be better to install a seperate earth spike and connect the botom of the arrestor to that to make sure that you have a good earth but it is sometimes not possible if the DB enclosure is indoors.
What is meant by this is a 220v bulb?
Every electrical device has its operating range of voltage and current for which it is designed for. If it exceed the operating range of voltage, its insulation will damage and device will not work. 220V bulb means the normal working voltage for this bulb is 220V. It can operate on the voltages with a deviation of 5% voltage variation also. this variation depends on the devices and will vary with the manufacturer.
If resistance equals 5 ohm and voltage equals 6v then find current?
Ohms Law! E=IR Voltage equals current times resistance. Get out the old calculator...
What is an acceptable value of 132kv Isolator contact resistance test?
132kv MOCB acceptable value of somthing 150 micro ohms.
No, LED bulbs are considered as a non-resistive load. They are semiconductor devices that convert electricity into light using a diode. LEDs operate by controlling the flow of current through the diode, rather than resisting it like traditional incandescent bulbs.
How much the efficiency of the stepper motor?
It depends on a lot of factors - if the stepper is stopped between steps, the efficiency is zero.
Earlier this week, I had a small nema23 size motor driving a pump and got about 20w of mechanical power out for about 40w DC in, or about 50% under optimal conditions.
What are the uses of galvanized nails?
Galvanized nails are nails treated with Zinc to prevent rusting and other types of corrosion. They are generally used in circumstances where the area may be exposed to drastic elements (humidity, wetness etc.).
