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Electrical Wiring
Ask questions here about proper wiring and electrical installation here.
4,935 Questions
Why are parallel circuits used in homes instead of series circuits?
When you add loads in a serial fashion the current reduces each time since the voltage remains constant. This would mean that your light bulbs and appliances would not work properly. Further, things would be constantly changing. In parallel, the current is free to increase as needed as loads are increased, up to the capacity of the circuit.
It is simple, in parallel connection the voltage is same and current is varied. hence it is used in household wiring. that's why even if you switch off one lamp then another lamps will glow without changing in it's brightness.
Similarly in the case of any accident if one equipment failed then it ll not affect the other equipment, where if u uses a series then the whole system shuts down.
They could not look a white man in the eye, they could not sleep with a white woman but it didn't matter the other way around. They was not allowed to be educated. They was not allowed to refer to themselves as human. They were not allowed to keep their children when they were ready for sale. In fact they were not allowed to do any thing that their owner didn't approve of. Many of America's grand old familys subscribed to this method of interaction with slaves.
Plant leaves for the production of sugar and cellulose.
Animal skin for the production of vitamin D.
Solar cells for the production of electricity.
Is there a download manual for sears rider mower model 917-273100?
Post an email and I will send you a PDF manual.
How do you wire a GFCI or an RCD receptacle?
A GFCI has two sides: LINE and LOAD. The LINE side is where your incoming power to the receptacle is connected. This provides power to the receptacle, and allows the receptacle to disconnect power to itself if a ground fault occurs on something plugged into it. If you have more receptacles 'downstream' that need GFCI protection, you may power them from the LOAD side of the GFCI. This puts all devices wired to the LOAD side under the protection of the GFCI, as if they were plugged into the front of it with a cord and plug. When a ground fault occurs on a downstream receptacle, it will trigger the GFCI, which will disconnect power to all downstream receptacles as well as the devices actually plugged into the GFCI face. To make things easy on yourself, my professional opinion is to never wire anything to the LOAD side of a GFCI. That way when a ground fault trips the device, you don't have to hunt around to find out which GFCI is tripped (there may even be some you don't know about). We build commercial buildings and our crew policy is never to LOAD side anything. If the box has a set of wires coming in and going out to the next receptacle, just connect both sets to the LINE side. ----
If you do not understand the work well enough to accomplish it yourself properly and safely, don't try it. Consult a professional electrician, as they are proficient enough to do it properly and safely. When working on electrical circuits and equipment, make sure to de-energize the circuit you will be working on. Then test the circuit with a definitive means to make sure it is off (multimeter with metal tipped leads, voltage tester with metal tipped leads, etc., not a non-contact tester, which is non-definitive.)
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Asking this type of question usually means you aren't ready to do this yourself. If you get any detailed "how to do it" answer here, you might attempt to do something you shouldn't be doing, and that may cost someone a shock, a home fire, or their life. <><><> Because you are asking this question here you really should not attempt to change these switches yourself. It is safest to give the job to a licensed electrician who will know how to check the circuits properly and can do a proper professional job for you. A so-called "two-way" switch is used to control a light or lights using more than one switch. For example, in a house with stairs, the light at the top of the stairs often has one switch at the bottom of the stairs and another switch at the top. Such 2-way switches always have to have 3 wires so they could be being used for this purpose, especially because of the colors of the wires. Those colors are the standard colors used for 240 Volt mains wiring in US/Canada, etc. Because the wires are soldered on it sounds as though someone has used some switches out of old radio or television sets to do the job they are now doing. <><><>
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.
If you do this work yourself, always turn off the power
at the breaker box/fuse panel BEFORE you attempt to do any work AND
always use an electrician's test meter having metal-tipped probes
(not a simple proximity voltage indicator)
to insure 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.
Could Old transformers contain gold and or silver?
Old transformers just contain copper and iron or steel. Sorry.
IT IS READ AS 200 MICRO-AMPERE OR 200 DIVIDED BY 1,000,000,000=0.0002 AMPS.
Can you interchange batteries in power tools that have the same voltage but different ah levels?
As long as the connection is secure and using the battery causes no safety hazards (i.e. no visible leads, properly secured connections, the battery was designed to fit the specific power tool) there should be no issue.
AH or Amp-Hours is a measure of the length of time the battery will provide power before dying. Higher numbers mean a longer run time between charges.
The voltages must be the same to avoid damaging the tool.
Ground fault interupter.
Where can you find electromagnets in every day life?
Most of the time you can find them in speakers or in motors, computer hard drives and they even use giant electromagnet in scrap jards to lift magnetic objects.
Can you use a 240 Volt battery charger on 110 volts?
The depends on the current drawn by the 240 Volt battery charger.
Some appliances, such as small battery chargers, small "voltage converters" for international travel, electric shavers, etc., have been designed to run safely on different supply voltages. The appliance's label or "rating plate" will state the range of voltages it can safely be used on.
Whilst a small appliance like that will work fine as long as it was made to handle the lower voltage, it's not possible to use a small "voltage converter" for international travel with high-powered appliances such as 220 - 240 Volt electric kettles. The reason is because the current they draw is much too high.
Larger 220 - 240 Volt appliances having powers from (say) 100 - 200 Watts (which may be the case for a large battery charger) to 2000 Watts (2kW) or more, like an electric kettle, would need an expensive item called a "Transformer" or "Auto-transformer" to enable them to be used on a 120 Volt supply.
Such transformers are much bigger - and heavier - than the small "voltage converters" that are available for international travel. Large transformers are also much more expensive: they can cost from US$100 upwards, even second-hand, depending on the power to be converted.
So most folks would just buy a 120 Volt appliance locally in the 120 Volt area. After all, a cheap electric kettle can cost less than US$20 and a really fancy one can be bought for under US$100.
Is 5 voltage drop acceptable for 480v motors?
NEC recommends a maximum 3% drop for branch circuits. 5 volts is well within this range. So, yes 5v drop is normally fine, unless the motor manufacturer has a more stringent requirement.
What is mean by interconnected star?
interconnected star or (Zig Zag connection) is a method of connecting the phase windings of a three phase transformer. normally, it's used for earthing of the the delta-connected low tension side of power transformers. it has the benefit of eliminating third harmonic in the winding terminals, it also can be used as the auxialry transformer that provide the substation with it's own needs of electric power as following:
case 1: using the Z winding as earthing transformer: in this case the winding is stand alone, it means no primary or secondry side , simply , it's one three-phase winding, each phase winding is divided into tow equal peices, then these peices are interconnected in a manner that the first half of phase R is connected to the second half of pahse T, The first half of pahse S is connected to the second half of phase R, and the first half of phase T is connected to the second half of phase S: these connections are done but in reverse in order to eleminate third harmonic in the phase voltage , then reducing the neutral conductor size and also giving almost pure faundamental voltage to the load.
interconnected star or (Zig Zag connection) is a method of connecting the phase windings of a three phase transformer. normally, it's used for earthing of the the delta-connected low tension side of power transformers. it has the benefit of eliminating third harmonic in the winding terminals, it also can be used as the auxialry transformer that provide the substation with it's own needs of electric power as following:
case 1: using the Z winding as earthing transformer: in this case the winding is stand alone, it means no primary or secondry side , simply , it's one three-phase winding, each phase winding is divided into tow equal peices, then these peices are interconnected in a manner that the first half of phase R is connected to the second half of pahse T, The first half of pahse S is connected to the second half of phase R, and the first half of phase T is connected to the second half of phase S: these connections are done but in reverse in order to eleminate third harmonic in the phase voltage , then reducing the neutral conductor size and also giving almost pure faundamental voltage to the load.
How much light can the color white absorb?
White does not absorb light - it reflects all visible light waves, while black absorbs all visible light and reflects nothing.
How long does piezo material last?
Great question: A piezoelectric material such as quartz might a very long time, but they do age. But for applications where absolute frequency stability is needed, other methods are used. See: http://en.wikipedia.org/wiki/Crystal_oscillator
Erbium-doped optical fiber is used for what purpose?
It is used to make Erbium doped fibre amplifiers (EDFA) and also used to fabricate DFB lasers.
How do you measure watts output of a generator?
To do it yourself you will have to be familiar with an amp meter, and ohms law, and be able to trace to main wire leads from the stator windings. I'm sure that an electric motor repair shop would do it for you cheaply. Have you closely examined all tags and labels on the unit? Take the cover off and look real good. UL requires that all manufacturers properly tag all equipment with capacities.
A quick rule of thumb, take the amperage of the breaker that protects the plug on the generator. Multiply this amperage by the voltage that comes from the plug. This will give you an indication of the power in watts that this generator should be able to produce. Watts = Amps x Volts.
Does current affect electromagnetism?
Does current affect electromagnetism? No. Does current affect magnetic fields? Yes.
The laws (Maxwell's Equations) pertaining to electromagnetism is constant and will not change regardless of current applied. However, Maxwell's equations does dictate that a change in current will essentially result in a change in magnetic fields. Current flow will produce a magnetic field perpendicular to the current direction.
How are electromagnets used in toasters?
The latch release in the toaster is held shut by an electromagnet.
In modern toasters this is achieved by driving the electromagnet with a timing circuit . The timing circuit stays live until a capacitor reaches maximum charge, and then as the current dies, the magnetic field dies and the electromagnet releases the toast carriage, which is returned by a spring to eject the toast.
In older toasters, the electromagnet current was released by the motion of a bimetallic strip breaking the current.
What kind of metals are used to make thermocouples?
There are a variety of metal pairs that are used to make thermocouples. Two common pairs are chromel-alumel, known as type K , and copper-constantan, known as type T. A good reference is Omega Engineering (omega.com) or azom.com.
