Electrical & Test Equipment » hardware

The lowest resistance in a commom electric circuit containing a common lamp is in the?

I may be way off track here but is it in the lamp filament or in the connecting wires or neither?

The wires will be the lowest resistance.
The lamp will be the load on the circuit.

Low-voltage Fuses and Circuit Breakers

The paper is attempting to describe in a simple way the physical background of low-voltage fuses and circuit breakers operation in conditions of high short-circuit currents. Further, it attempts to draw some conclusions from their operational peculiarities, that substantially influence the practical application of fuses and circuit breakers.

Introduction

Under the slogan “Safety First” are presented in the following discussion low-voltage fuses and circuit breakers as the most important and most frequent protection elements in electrical engineering, viz. electrical installations.

The basic physical and electrical processes in short-circuit conditions are shown. The paper attempts, on the one hand, to demonstrate the advantages and drawbacks of both protection elements, and, on the other hand, to indicate the way of thier interaction, with particular emphasis on their operation in the domain of high short-circuit currents.

First of all, the following criteria have to be observed when selecting the protection elements:

- Safety

- Reliability

- Quality

- Diversity

- Economy

An electrical installation has to be designed and manufactured in such a manner to allow the protection device to cut an electric circuit only when it is really necessary. But at that time with an absolute reliability! When a fault arises, the protection device, whether a fuse or a circuit breaker, must disconnect an electric circuit before a damage on installation, power source or consumer occurs.

Advantages and drawbacks of fusible cut-outs - fuses

As said above, when evaluating advantages and drawbacks of an individual protection element, the above mentioned criteria have to be observed:

Safety:

* High degree of current limitation,

* Low values of transient integrals,

* No leaking out ionizing gases,

* Low power losses.

Reliability:

* After the cut-out the fuse cartridge is replaced, the properties of the new one are fully available,

* Aging resistance,

* Simple use.

Quality:

* Today's production is highly automated, which ensures small deviations in technical characteristics of the whole quantity of products from the regular production.

Diversity:

* Use in low- and high-voltage networks,

* Protection of electronic apparatuses and devices.

Economy:

* In comparison with its capabilities and dimensions as well as price, this is the most economic solution.

The drawbacks of the fusible cut-outs are mainly due to the following facts:

* They have to be replaced when a fault occurs, which usually means a specific time without power;

* More difficult setting of the I-t overload characteristic, which depends on the physical processes in the fusible element.

Advantages and drawbacks of the circuit breakers

Comparison of circuit breakers by the same criteria:

Safety:

* Possibility of exact setting of the current-time characteristic;

* Otherwise large enough degree of the current limitation, still on account of economy.

Reliability:

* The truth is that modern design solutions ensure a high degree of reliability, but with time, or with the number of cut-offs the characteristics of each circuit breaker are gradually being deteriorated.

Quality:

* The same applies to quality.

Diversity

* Very wide possibility of use, at NN, SN and VN levels;

* The use of electronic in tripping circuits increases the applicability.

Economy:

* The economy appears primarily in short reconnecting times;

* The power circuit breakers involve a big difference in the product price.

The weakness of circuit breakers appears primarily through the following facts:

* At disconnection an exhaust of ionizing gases appears, that can cause various consequences in the switch cabinet;

* With the number of short-circuit disconnections a circuit breaker gradually loses its technical properties.

About the Author

Electric Circuits

Card Reader

admin — Sun, 02 May 2010 08:30:08 +0000

Card Reader

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What kind of memory card reader should I get to use for getting pictures off my Canon Powershot to my PC?

I have a Canon PowerShot SD1100 and a Dell desktop computer- the camera wont hook up to the computer with its cord anymore- my computer wont recognize it. What kind of memory card reader would work?

The memory card in the camera is an SD-K046 4 GB.

Any 4 in one, 8 in 1, or 12 in one reader will do. You jsut need to make sure it reads SD MEMORY.

Getting the Best From Discount Card Readers

Card readers are often mistaken to be some type of memory card. But in actuality, card readers are just external gadgets that can read almost any type of memory card. They come in all sizes, colors and architectural designs. Most of them also have multiple slots for different types of memory cards.

Card readers were for the purpose of avoiding having too many types of slots or sockets on the CPU. There are almost more than ten types of memory cards that are used for various technological gadgets with each type available in multiple versions. A digital camera’s memory card for instance is different with a mobile phone’s memory card or a certain phone model’s memory card may not be the same as another model’s. So, if you use different types of technological gadgets with memory cards, a card reader is definitely a must-have.

Basically, using card readers is easy since there are no hassles of installing it. They are usually compatible with USB 2.0 ports that can be run via plug and play. And not only is using it easy, buying it is easy as well. There is nothing much to a card reader’s technological make-up; just a bunch of sockets, a case and a USB cable. For this reason, card readers are practically affordable. But despite its affordable price, online stores even offer better price-deals; card readers are often sold at a discount.

Card readers that are being sold at a discount can be appealing. However, do check if you really are getting a great deal with discount card readers. Here are some of the things you should check for:

1. Socket Type. Memory card sockets are continuously changing. Last year’s version of memory cards may already be phased out and recent memory cards may have different socket type requirements. Ensuring that your chosen discount card reader supports older and recent sockets may save you from unnecessary expenses. Also, you may want to get a card reader that has the maximum number of slots, 4 slots usually.

2. Packaging and Postage. When shopping online, one of the costs that you have to check aside from the price tag is the cost for packaging and postage (p&p). Compare prices between discount card readers and regular priced ones. You may actually pay more when you buy discount card readers that do not include p&p compared to buying at regular price that includes p&p.

3. Brand New. Online stores also sell used gadgets that are still in good working condition. These are usually offered at low prices or at a discount; however you may want to avoid them. Some used card readers may have older versions or types of sockets. So, when a new memory card comes out, your used card reader will be useless. Eventually, you will have to buy a brand new card reader to replace the used one.

4. Warranty. Warranty is a form of assurance that you get defect-free products. Its cost is always based on the price tag and not the same for all products, so consumers won’t have to worry about getting insurance on low-priced products such as discount card readers. Check the discount card reader’s warranty offer especially if you are buying more than one. A product with insurance is always better than one without it.

About the Author

Bei M. with with Pcmarketusa – computer systems and computer parts reseller best online source. If you are looking to get discount card readers, Mp3 players, or other items then Pcmarketusa is perfect source for you.

Magnetic Swipe Card Reader/Writer MSR and Program

Amp Connector

admin — Sun, 02 May 2010 03:38:24 +0000

Amp Connector

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17h 45m

10Aluminum AMP AC Power Socket Male Connector PlugM3W

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17h 46m

Which speaker cable connector is better - Neutrik Speakon or 1/4" plug?

I'm looking to hook up speakers to my amp and on one end I'll need the banana connector but on the other end of the speaker cable I have a choice of using 1/4" or Neurtrik Speakon connections to the speaker. Which of those two connections is better and why? Incidently I'm looking to get a 12 gauge cable too. Thanks.

Definitely go with the Speakon. It was designed from the ground up to be a speaker connector. The 1/4 inch connector is a very old design and was never meant for speaker level voltage and current.

The speakon will never pull out, has low contact resistance, no soldering needed, accepts large gauge wire, super durable (need I go on?). Plus you'll look more professional.

Car Maintenance and Repair Q&A

Problems next to my ancient Fiesta?
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i have a automatic toyota corolla 1995,while driving next to the car within D it takes a long time since the car correct the gear and the engine races up what can be the problem and how do i solve it please.

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Hello, I have a a Opel Vectra but its started develeping problems the coolent needs toping up every 48hours regardless of the Kms. Also Battery get flat if the car has be left for more than 24hours. Also at low revs (-1750RPM) the oil wispy comes...

Problems running my pit bike?
I have a pit bike and can't return with it started. I hold the clutch/brake in and hold the eletric starter and it does start but as soo as i permit go of the clutch or the electric starter it stalls. I not long got it and...

Problems starting 1997dodge avenger?
i dont think its my starter and i in recent times got a spanking new battery.so heres whats stirring. Sometimes the car will start up first time and later other times i will have to crank the switch over and over again for 5-10 min's then...

Problems starting motor?
had a deceased battery and which i replaced over the weekend, after i started it and drove around this morning and parked and tried to start again it wouldn`t the dome oil lamp wouldnt even come on or power locks dont work but after a few hours...

Problems starting my 2002 YZ250F after a stall!!?
When I first start my bike for a ride with the cold choke on I can start my bike first see.Then while riding if I stall it for whatever purpose I get fund on try with hot choke nil try with cold choke zilch try with nil...

250 watt speakers have need of investigational radio??
Ok so i get 2 new 6x9 250watt speakers for my sports car but my car radio (which is not the factory installed one, its a jvc kdg-300)has a 50 x 4max watt output. So i would think i have need of to upgrade....

2gig ipod beside a griffin radio adapter serve?
i have a 2gig ipod nano and i have a griffin radio adapter piece for it when i plug it into my ipod it turns on the adapter but it covers up the earphone thing please help out! i think that it goes near it because...

2nd gen neon radio (signal) connector won't fit aftermarket stereo...both feminine connectors. What can I do??
The problem is that the (to get radio signal) connector is a womanly connector and so is my stereo, so it won't fit.

2ohm+4ohm subs??
i have 1 15in kicker cvr 2ohm and 1 15in cvr 4ohm both hooked up to a kicker 1000zx amp. now when i have them wired wit 2 2ohms it sounded like crap. its soo much better wired as 2 ohm and 1 ohm combo, but...

2sony exploid midranges 180watt?
I would like to know why the coupé stereo that i put on my truck which is a pioneer nothing fancy, flares too much when i complex the volume a little loud, I aint running factory speakers though the ones that i enjoy hook are 2exploid ...

2x Kicker L7 Subs, Amping and Wiring Help?
I am planning on buying 2 12" L7 (4ohm) subs and was wondering what the best preference in lingo of amping them is. Should I go for 2 monoblock amps or one dual ditch amp. In both casses I would match the Rms rating of subs, but...

3 and 4 opening speakers? what does it denote?
what does 3 way and 4 process speakers mean?? how can i update what speakers will fit my car?... i know i inevitability 6 x 9 but i dont know if the jacks are all different or same?

3 Kicker L7 12's or 4 Kicker L7 10's?
What would hit harder? I want my system being the loudest one on the block, resourcefully in the damn city. =] or should i find room to fit that fourth 12? i doubt it'll fit.. i want them crinkly straight up in the trunk of...

4 10 inch sub woofers adjectives out on correct songs next to max power?
i have the proper gague wire for ground and the amp is solitary 250 watts ( don't laugh it actually sounds pretty clean) and for some point my entire bass system cuts out afer 3/4ths volume on certain songs...i m thinkin i just involve a bigger...

4 diamond d3 15's or 2 solobaric L7 15's?
i either want 4 diamond d3 15's or 2 l7 15's. which should i pick? i will be putting these on a kicker zx1500 amp and i will get a custom box for any... i really want spl but i like to have sql too

4 Ohm speakers near 2 Ohm amp.?
I have 2 12" subs (a) 4 ohm with a monoblock amp(220W RMS x 1 at 4 ohms (400 watts RMS x 1 at 2 ohms). If I lead in parallel, will each sub capture 200 W RMS or will the impedance of the subwoofers...

4 ohm subs , how plentiful terminal?
its 2 kicker cvr 12" both 4 ohms, I KNOW HOW TO WIRE THEM DOWN TO 1 OHM BUT I JUST NEED TO KNOW IF I ONLY NEED ONE OR TWO TERMINALS?

How do I recode my Rover/Philips Car Stereo near my code I already hold?
I bought a second hand Rover 214 sports car this year and had to receive the battery changed, once that be done, I noticed that the motor stereo no longer worked as it was coded.... I'VE NOW GOT THE CODES NEEDED from software a friend have ......

300 watt system?
My total system consist of 2 12's and a 300watt amp. My question is if I listen to my music near my car rotten will that drain my battery? Or is 300 watts not adequate to really do anything to my battery? I would detestation that I...

3000 watt amp 2 kickers?
is is ok to use a boss 3000watt mono(1 channel) amp on two 12" kicker woofers 800 watts 400 rms both 4 ohms... will the amp be ok or is it too much power? thanks

300m 1999 Speaker Replacement?
Hey, 3 of my speakers are blown out, it's both the side panel speakers in the front door, and one the the mini speakers mounted by the windshield on the driver side door. It have the infinity sound system within it with the amp...

300zx bose stereo?
I have a 1990 300zx the only zx near center bose speaker. and I want to hook up a cd player in it but I want the center speaker to work to but I don't know if I can do this without the inspired bose stereo...

350z Bose sub direct sub replacement? whats the ohms rating for it?
ok the Bose sub sucks. any one replace there Bose sub on the 350z? what kindly and what was the sub? I hear it could be a pain surrounded by the A-- cause of the ohms are not you??e typical 4ohms. the guy at the store...

3L1T-19C013 Ford Headphone Receiver?
Hello I recently got a bulk of Lincoln Navigator/F150/F250 standard wireless telephone. The headphones are ID:3L1T-19C013-AA. Is there any course i can get a transmitter for something like an mp3 player or home stereo? Originally these phone are for in car use next to a DVD...

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Debugging The Bugera 333XL - Burned Up Transformer Connector (Follow Up To Amp Rant Part 1)

Analog Power

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how does analog energy meter multiplies voltage current and power factor?

I assume you are talking about a wattmeter with voltage and current terminals. The meter does not actually multiply by the power factor. It combines the voltage and current readings, but if they are out of phase, the watt reading is lower, and will be zero if they are 90 degrees out of phase.

WMPN-TV Jackson 29 Analog Power Reduction Info