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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 one different between a galvanometer and an electric motor?
Well, darling, a galvanometer is a device used to detect and measure small electric currents, while an electric motor is a device that converts electrical energy into mechanical energy to produce motion. So, in simpler terms, one tells you how much juice is flowing, and the other one actually does the heavy lifting. Hope that clears things up for you, sugar!
How many times can electricity travel 3000 miles in just one second?
62 times in one seccond
AnswerIf, by 'electricity', you mean electric 'current', then the answer is that it doesn't travel at the sort of speed you describe. In fact, it travels very s-l-o-w-l-y indeed -in the order of micrometres - millimetres per hour! A single electron will not even travel the length of a flashlight's filament within the lifetime of the flashlight's battery!
Advantage and disadvantage of fixed bias circuit?
Advantages:
1) This is a simple circuit which uses very few components
2) The operating point can be selected anywhere in the active region of the characteristics by simply changing the value of Rb.Thus,it provides maximum flexibility in the design.
Disadvantages:
1) Thermal stability is not provided in the circuit.Thus Q-point is not maintained.
Ic = β Ib + Ico
Ic = β Ib
2) Since Ib is already fixed,Ic depends on β which changes unit to unit and shifts the Q-point.Thus the stability is very poor.
Can a 125v cord be used with a 120v appliance?
Yes and no. The voltage rating of the cord and appliance are compatible, so that's not an issue. However, the cord must be thick enough to handle the maximum load the appliance will draw (amperage). Thicker cords (lower wire gauge) can handle more current. Running high draw 120V appliances, such as toasters, microwaves, window AC units and especially hair dryers on extension cords or undersized wiring is a serious fire and shock risk. Special heavy duty appliance cords (usually 10 gauge wire and <10' long) are available for 120V applications at most hardware stores. Ideally, the cord would be hard wired into the appliance, and not be excessive in length. The ground pathway, if applicable, should be maintained as well.
A material that allows electrons to flow freely is called a?
A material that allows electrons to flow freely is called a conductor. Conductors have low resistance to the flow of electric current due to the presence of free electrons that can move easily through the material. Common examples of conductors include metals like copper, aluminum, and silver. These materials are used in electrical wiring and circuitry to facilitate the movement of electrons.
Why does polystyrene melt when in contact with plastic electrical cable insulation?
Isn't polystyrene commonly known as "styrofoam" ?
If so, why is it coming in contact with electrical wiring?
In any event, if the polystyrene is melting, the wiring may be overloaded or has a hotspot due to a failure. The wire may be getting hotter than it should be.
I am not aware of any chemical reaction that would occur if the two plastics touch each other at room temperature.
I am:-
Polystyrene is commonly used in loft and wall insulation, just the places that cables are run. The plasticisers used to make the PVC insulation on the cables flexible reacts with the polystyrene resulting in the polystyrene appearing to 'melt' and the plasticiser migrates out of the cable making it brittle and causing the insulating properties to break down. The cable will eventually fail, especially if disturbed and this is both a fire and electrocution risk.
There is the added problem that the cables will get hotter due to the thermal insulation properties of the polystyrene preventing the cable from losing heat. If this hasn't been allowed for in the design of the circuit it too could be a fire hazard.
The wiring regulations (BS7671 section 522.5.3) prohibits contact between PVC cables and polystyrene, but this is a common problem. An electrical engineer (or most electricians) can do a periodic inspection of your wiring system that includes insulation tests that will identify failed or failing cables. The only solution is to replace damaged cables and reroute them or provide conduit to protect them.
PS Styrofoam is, I believe, an American brand name for polystyrene often associated with disposable coffee cups and similar products.
What are the mechanical and electrical characteristics of a DC shunt motor?
mechanical characteristics can be drawn between speed and torque
electrical characteristics are
1. Output power vs speed
2. Output power vs input power
3. Output power vs efficiency
4. Output power vs torque
5. Output power vs line current
What is current coil and voltage coil?
The current coil is one through which the current of source can pass. This coil is connected in series. The voltage coil is connected parallel to the applied voltage. In the current coil the quantity of current flowing is proportional to the current flowing in load while in the voltage coil, current flowing is proportional to applied supply voltage. The voltage coil current is independent of current flow in load. For a complete understanding, please refer to a watt meter diagram.
Where can I find a schematic diagram of a forward reverse magnetic contactor switch?
Oh, dude, finding a schematic diagram for a forward reverse magnetic contactor switch is like finding a needle in a haystack. You might have better luck asking a unicorn for directions. But seriously, you can try checking online electrical forums or contacting the manufacturer for the specific diagram you need. Good luck on your quest for knowledge!
What refers to the number of separate staggered power winding's in the motor or alternator?
The term you are referring to is "phase." In a motor or alternator, the number of separate staggered power windings is known as the phase. The most common types are single-phase and three-phase systems, with three-phase being more efficient and widely used in industrial applications due to its balanced power distribution. The phase configuration determines the motor's performance characteristics, such as torque output and efficiency.
Well, isn't that a happy little question! To connect the motor control to the PC, you can use communication cables like Ethernet or USB. These cables allow the programmable controller to send commands from the PC to the motor, creating a harmonious flow of information and control. Just remember to make sure everything is connected securely and with love, and your motor will be dancing to the PC's tune in no time!
Why UPF wattmeter is used in SC test?
UPF(Unity Power Factor) is connected as the power factor is 1. Unlike OC where quantum dynamic rules apply in SC the time space gravitational lensing takes place which is why only LPF can be used.
Why are circuit breakers and contactors coated with silver?
Silver is used because it is the most conductive metal we have discovered. It also resists oxidizing, only doing so in the presence of sulfur, some halogens, and both nitric and sulfuric acids. The sulfur in many foods is what makes real silverware tarnish...a thin coating of sulfide is formed.
http://www.tpub.com/content/navyict/14120/141200066.htm
http://www.daviddarling.info/encyclopedia/S/silver.HTML
AnswerI think silver is supposed to be a good conductor of electricity. ANSWER:It prevents the contact points from corrosion and oxidation. Its not silver, its a mixture of tin and lead called solder. AnswerSilver is the best metallic electrical conductor...until it tarnishes (oxidizes)...at which point it becomes a rather poor conductor. Plated contacts are usually coated with Gold, which is almost as good a conductor as silver, but it's oxidized form still conducts about as well as pure gold. As for solder, it's usually a lead/tin alloy in electronics work, but can also be made with small amounts of silver as well. Lead in solder has been banned for piping where potable water is carried in the US. Answer: They're not.The issue isn't one of picking a metal or metal alloy that conducts well, but one that will resist damage or pitting due to electric arcing. Alloys with tungsten are often used. There are some other metals which can be alloyed to make arc resistant contacts, and they're all pretty exotic ones. Silver is the best metallic conductor at room temperatures under normal conditions, but switch contacts don't operate under "normal conditions" when they are opening and closing regularly.When a current carrying contact set (like in a switch or circuit breaker) comes open, an arc will begin across the forming gap. This arc will continue for a short while as the contacts get farther apart and eventually will be extinguished. The arc will cause a bit of damage to the contact surface for that little bit that it's happening. Soft metals like silver, gold, copper and aluminum will get pounded by the arc. It will shred them in such a short time that it isn't worth building a contact set with them, at least not on a contact set that is going to get a lot of work opening and closing.
Why do people call the microphone with that name instead of macrophone?
microphone coined from Gk. mikros "small" + phone "sound" (see fame). Modern meaning dates from 1929, from use in radio broadcasting and movie recording. Earlier, "telephone transmitter" (1878) and "ear trumpet for the hard-of-hearing" (1683). Of the two spellings of the short form of the word, mike (1927) is older than mic (1961).
So they call it micro-phone due to the fact that it will record/trasmit even the smallest of sounds.
Macrophone has recently been coined by persons in the (voice over IP) field or VOIP as (a large sample of a recording or transmission).
The conductor used to connect equipment or circuit to an earth electrode is earth bond or in some cases a supplementary bond. This will be generally carried out using a copper tape or an earth cable.
How does a code generator work?
Code generators are used to hack into programs that typically require a license to use. The generator scans through a series of numbers until it comes up with a pattern compatible to the program.
Why does the open-circuit test essentially show only excitation losses and not in copper losses?
Oh, dude, the open-circuit test is like when you're checking out a car but not actually driving it - you're just seeing how it revs up without any load. So, it's all about measuring the excitation losses because there's no current flowing through the windings to cause copper losses. It's like checking out a car's engine without actually taking it for a spin - you're just seeing how it purrs without any real work.
Differetiate between solid earthing and ELCB?
ELCB is the connection to the direct earth path using protective device.while solid earthing is without protective device.A form of ELCB should be installed when direct earth path of low enough impendance can not be obtained.
For electrical engineering, Mechanics will probably benefit you more. However, both courses would be good for your career.
Why you use one sided z transform?
to incorporate initial conditions when solving difference equations using the z-transform approach
