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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 does Amperes per Lumen stands for?
I don't believe that there is such a thing as an 'ampere per lumen'. An ampere is the SI unit of current, whereas the lumen is the SI photometric unit for luminous flux. There is no direct relationship between the two.
What its the difference between 110 single phase and 220 single phase?
Answer for USA and Canada power supply service. Electrical panel layout might explain where the two numbers come from on a single phase installation On a electrical panel boards the wiring numbers go from left to right, top to bottom. There are 2 hot legs coming into the panel. L1 and L2. Breakers on L1 are 1,2,5,6,9,10. Breakers on L2 are 3,4,7,8,11,12. This is a 12 circuit board. This configuration allows every two adjacent breakers to connect to 240 volts. Example 1 and 3, 3 and 5, 5 and 7, 7 and 9, 9 and 11. Same with the even number side. So you see that a two pole breaker connects across the two hot legs L1 and L2 no matter where it is on the panel board. Any of these breakers on a panel board to the neutral will give you 120 volts no matter if the supply leg is L1 or L2. Just remember L1 to Neutral equals 120 volts, L2 to Neutral equals 120 volts, L1 to L2 equals 240 volts. The amperage of a breaker is a limit of the amount of amperage it will allow to pass before it will trip. The wire has to be the right size for the breaker. Under sized wire will heat up if more current is applied to it that its rating will allow.
''Ohm's law is the tendency for material to oppose the flow of electrons''is this true?
No, that statement is not accurate. Ohm's law states that the current flowing through a conductor is directly proportional to the voltage applied across it, given a constant temperature. It describes the relationship between current, voltage, and resistance in a circuit.
What is electrical energy measured in?
Electrical energy is typically measured in kilowatt-hours (kWh). This unit represents the amount of energy consumed by an electrical device operating at a power of one kilowatt for one hour.
Common conductors found around the house include copper wiring in electrical outlets, metal pots and pans for cooking, and metal doorknobs. These materials allow electricity or heat to flow easily through them.
Clearance between phase to earth?
for 415V phase to earth min clearance is 25mm pallav
Comment
You cannot have a voltage between a 'phase' and earth. You should be asking the clearance between a 'line' and earth.
Is a separate ground wire required for each circuit in a conduit?
No, a single ground wire can be used for multiple circuits in a conduit as long as it meets the sizing requirements based on the largest circuit conductor in the conduit. The ground wire provides a path for fault current to safely return to the source in case of a fault or short circuit.
Structure of human heart with its working?
Hear is a pumping organ. It consists of four chambers. upper two chambers called Auricles and lower called Ventricles.
Left side of the heart is filled with Pure blood and right side with impure blood.
How do you check a 3 phase motor?
Depends firstly on the type of motor and secondly what your testing for.
If you are the manufacturer, you test according to the IEC/AS Codes for electromechanical machines.
Considering just one type of 3 phase motor, the Squirrel Cage: if you are testing it electrically, then first of all you have to check the insulation resistance of each phase to earth with an appropriately sized megger (insulation tester). Then you measure the stator's winding resistance between each phase. (You don't check the phase-to-phase on the rotor as it's basically a dead short for Squirrel Cage motors.)
If you are load-testing, depending on the codes you are following, you start it up and run it for around 8 hours. During this period you take temperature measurements on the windings and the bearings and vibration measurements of the bearings. For the stator windings, you just measure the temperature of the stator housing unless the motor is big enough to have its own set of built-in RTDs. (Remote Temperature Detectors.)
What is one half breaker scheme used for 400220kv substation?
a method of interconnecting several circuits and breakers in a switchyard so that three circuit breakers can provide dual switching to each of two circuits by having the circuits share one of the breakers, thus a breaker and one-half per circuit; this scheme provides reliability and operating flexibility, and is generally used at 500 kV when more than five lines terminate in a substation.
The reason you were lucky not to have been electrocuted was probably because of these reasons:
1) This sequence took place within much less than a second: the pliers first cut through the Neutral wire, not the Hot wire, and that Neutral wire protected you when the pliers then went on to cut through the Hot wire.
2) The jaws of the pliers probably melted from the high current but that same high current caused the household power supply circuit's fuse or circuit breaker to cut off the currentbefore you could be electrocuted.
We all do something like that at some time or other, not only with electricity but using any tools we are unfamiliar with... driving a car... whatever. Now you must know that you were foolish to cut the cord without first making sure that the cord was unplugged from the supply outlet!
Sometimes we have to learn things the hard way and this was one good result from your mistake.
How are watt mega-watt giga-watt defined?
A megawatt is 1000 kilowatts (also equal to 1341 horse power) or 1*10^6 watts, a gigawatt is 1000 megawatts. A watt is equal to one joule per second and a joule is defined as the amount of work done when 1 ampre of electrical current is passed through 1 ohm of resistance. Ohm is defined as the amount of electrical resistance of a conductor in which 1 ampre of current is produced by a potential of 1 volt across its terminals.
To measure battery current, you can use a multimeter set to measure current in series with the battery. Connect the multimeter in series between the battery and the load to measure the current flowing from the battery to the load. Make sure to select the appropriate current range on the multimeter to avoid damaging the instrument.
It refers to unwanted current flow to ground.
This term is also called ground leakage, depending on what part of the world you live in.
For more information see the answers to the Related Questions shown below.
The merging of a free electron and a hole is called?
The merging of a free electron and a hole is called recombination. This process occurs in semiconductors when an electron fills a hole in the valence band, resulting in the release of energy in the form of light.
Cogging torque is the phenomenon where a permanent magnet motor experiences non-uniform force during rotation due to magnetic attraction between the rotor and stator teeth. This can cause vibrations, noise, and affect the smoothness of the motor operation. Design techniques such as skewing the rotor slots or using sinusoidal winding can help reduce cogging torque.
Atoms.
Electricity is not something you can "break down" into "elements".
You can use electric energy to drive certain chemical reactions. For example, you can split water into hydrogen and oxygen. But that does not mean that electricity is "made of" hydrogen and oxygen. Water is.
Electric current is made of electrons flowing in a conductor such as copper or aluminum. (e.g. wire)
The wire does not weigh any more, or less, for having electricity flowing in it, as the electrons in question were and are always there, even if no electricity is flowing. It is just that in conductive materials (like most metals, like copper) the outer electrons of the atoms are fairly loosely bound to the nuclei. So electric current involves shoving electrons into one end of the wire and taking the same number out the other end. This is done by applying "electromotive force", EMF, which we measure in volts and is commonly called "voltage". The total number of electrons in the wire remains the same. The electrons just move along from one atom to the next, so the net charge in the wire remains zero.
This does make electricity "weightless", I suppose. However this would not cause the wires in transmission lines to "hang upwards" because the weight of the wires themselves would still be there. Again, the wires don't weigh any more - or any less - for having electric current flowing in them.
You can transport by train chemicals and materials which, when arranged in the proper way, produce an electromotive force. We call such an arrangement a "battery." However batteries are a very inefficient means of storing electrical energy. Just for comparison, a liter of gasoline contains the equivalent of 9000 watt-hours of energy; a liter's worth of lithium-ion battery, the best currently available, contains only 250 watt hours.
The materials from which primary batteries (those that start out charged and can only be used once) are not in infinite supply, either, so the idea of just making batteries instead of using fossil fuels won't work. There's a LOT more latent energy in the ground in the form of fossil fuels than there is in chemicals that could make batteries. And batteries aren't the most environmentally-friendly things either.
Electricity flowing in wires is an extremely efficient, clean, safe, and convenient way to move energy around. So much so that if you have electricity, about the last thing you want to do with it (from an energy efficiency point of view) is to use it to e.g. make hydrogen or charge a battery.
moving electrons
Can you convert a 3-phase heater to single phase?
This idea is not economic.
It would cost more to convert it safely than buying one or more single phase heaters (either second-hand or new) to give the same heating effect.
3-phase heaters are not usually intended for domestic use in homes, except for the latest new-builds which have 3-phase supplies. They are commonly used in industrial sites (factories, workshops, etc.) or large public areas (department stores, airline terminals, etc.) where a 3-phase power supply would be installed as standard at the site.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
How do you convert a 3 phase car lift to single phase?
The best way is usually to buy a new single-phase motor and replace the 3-phase motor.
You can also buy something called a rotary phase converter, but for any amount of HP they are about as expensive as a new motor. Expect to pay 500 to 700 dollars US for a 10hp rotary converter.
Static phase converters are not a good choice for motors that start and stop or reverse often, such as yours.
How do you decide KVAR rating of capacitor bank?
Generally the capacitor rating of a bank are decided on the load factor.ie higher the KVAR higher the capacity.KVAR is the reactive power in which load angle differs with the load variation.If we know load factor multiply it by the sine angle which gives us the capacity of the cpapcity of the load bank. Generally the capacitor rating of a bank are decided on the load factor.ie higher the KVAR higher the capacity.KVAR is the reactive power in which load angle differs with the load variation.If we know load factor multiply it by the sine angle which gives us the capacity of the cpapcity of the load bank. Generally the capacitor rating of a bank are decided on the load factor.ie higher the KVAR higher the capacity.KVAR is the reactive power in which load angle differs with the load variation.If we know load factor multiply it by the sine angle which gives us the capacity of the cpapcity of the load bank.
The location of lightning arrestor is?
Lightning arrestors are typically installed at the highest point of a structure to provide a path for lightning to safely discharge into the ground, thus protecting the structure from damage. They are commonly found on rooftops, towers, or any high points where lightning is likely to strike.
What are the examples of conductivity?
Some examples of materials with high conductivity include metals like copper, silver, and gold. Other examples include materials like graphite, which is a good conductor of electricity due to its structure of delocalized electrons. Conversely, insulators like rubber, glass, and plastic have low conductivity.
The energy used by the heating element can be calculated using the formula: Energy = Power x Time. Power can be calculated using the formula P = V x I, where V is the voltage (110 V) and I is the current (3.2 A). So, P = 110 V x 3.2 A = 352 W. Therefore, the energy used by the element over 5 hours is 352 W x 5 hours = 1760 Wh or 1.76 kWh.
What is a Reverse current relay?
A reverse current relay prevents a generator from discharging the battery when generator output is less than battery voltage. When generator output is greater than battery voltage, the reverse current relay closes and connects generator to electrical bus.
What type of jobs can you get as a chemical engineer?
Typical jobs you can get as a chemical engineer:
1. Production Engineer
2. Process Engineer
3. Quality Control and Reliability Engineer
4. Plant Manager
5. Advanced Process Control Engineer
6. Operations Manager
7. Environmental Specialist
8. Project Supervisor
9. Energy Expert
10. Materials Technologist
