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Electrical Wiring
Ask questions here about proper wiring and electrical installation here.
4,935 Questions
The definition of electricity is the flow of charge. Usually our charges will be carried by free-flowing electrons.
Negatively-charged electrons are loosely held to atoms of conductive materials. With a little push we can free electrons from atoms and get them to flow in a generally uniform direction.
A closed circuit of conductive material provides a path for electrons to continuously flow.
The charges are propelled by an electric field. We need a source of electric potential (voltage), which pushes electrons from a point of low potential energy to higher potential energy.
Who invented center tapped transformer?
if you are referring to a split-phase transformer, the answer is a Westinghouse engineer, C. F. Scott, in the late 1890's to bypass Edison's more expensive rotary-converter and thereby permit two-phase generator plants to drive Tesla's three-phase motors.
How do you stabilize an amplifier?
One method is by adding negative feedback from the output to the input stages.
What is the difference between path and route?
I did not found any differences other than that they have different names.
Path: must be used during REGISTER, and then use Route: afterwards.
Explanation: the Registrar will store the content of your Path: header used during the REGISTER phase, into the Route: header in subsequent requests (Registrar -> UAC).
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folays
How do you remove a capacitor from a circuit board?
Correct method:
Two pieces of equipment are needed. A small wattage soldering iron and a de
soldering tool. Heat the junction point up until the solder melts. Use the de
soldering tool to remove the melted solder. Do the same thing to the other side
of the capacitor by heating and removing the solder. The capacitor should now
pull away from the PC board.
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Lazy method:
--One piece of equipment is needed. A small wire cutter.
-- Select one end/side of the capacitor. Position the jaws of the tool on
either side of the wire emerging from it. Then cut.
-- Position the jaws of the tool on either side of the intact wire emerging
from the opposite end/side of the capacitor. Then cut.
-- The capacitor should now pull free of the terminal strip or printed board.
Why do engineers and architects need to work together?
Architects are "What"
Engineers are "Why"
and the Trades are "How"
What did John Mauchly and Eckert invent?
John William Mauchly (August 30, 1907 - January 8, 1980) was an American physicist who, along with J. Presper Eckert, designed ENIAC, the first general purpose electronic digital computer, as well as EDVAC, BINAC and UNIVAC I, the first commercial computer made in the United States.Together they started the first computer company, the Eckert-Mauchly Computer Corporation (EMCC). (Wikipedia) For the source and more detailed information concerning your request, click on the related links section (Wikipedia) indicated directly below this answer section.
Can potato be used to generator electricity?
How to Make a Potato Battery?
School students pursuing science projects are particularly interested in knowing why and how fruits and vegetables conduct electricity. A simple experiment presented here will surely help them understand how to make a potato battery and answer the above questions.
The First Battery
The answer to your question "Why do fruits and vegetables conduct electricity?" or rather generate electricity, may be better understood by first peeking into the past and knowing how the concept actually evolved.
The famous Italian scientist Luigi Galvani, while studying the anatomy of a frog, accidentally discovered that when the dissected frog's muscles were touched with a charged (with static electricity) metal could agitate the frog and make its ligaments twitch. Another renowned Italian scientist Allesandro Volta was quick to understand the principle acting behind the above phenomena. He realized that there was something inside the frog's flesh which reacted with electricity to produce the twitching effect. He was able to successfully reverse the process and, in fact, produce electricity. It wasn't hard for him to find out that the frog's flesh, which acted like an electrolytic chemical, when brought in contact with two different metals, could generate electricity. He further went on with his research and in 1800 made the first electricity producing battery using two dissimilar metals (zinc and silver) immersed in an electrolyte consisting of sulphuric acid.
His experiment may be understood as follows:
· The electrolyte sulphuric acid used is present as 2H+ and SO42-.
· The negatively charged sulphate ions (SO42- ) react with the zinc plate or electrode and the hydrogen ions react with the silver electrode producing a potential difference across them.
· When the two electrodes are connected externally, the circuit becomes completed to initiate the flow of electrons and constitutes the generation of electricity.
· Hydrogen gas is released during the process as a byproduct.
The following chemical reactions are involved in the process:
Zinc
Zn → Zn2+ + 2e-
Sulphuric acid
2H+ + 2e- → H2
From the above discussion, the idea becomes pretty simple to understand: by inserting two dissimilar metals into a chemical substance, electricity can be generated.
We know that plant and fruit cells internally are made up of various kinds of dissolved minerals in a liquid form constituting the cell sap. This cell sap is present inside all plants, vegetables and fruits, and is ideally suited to conduct electrons and also generate electricity (though quite feebly).
This cell sap may be effectively used as an electrolyte, and by introducing two dissimilar metals into its path, a chemical reaction as explained above can be initiated. Let's see how we can answer the question "Why do fruits and vegetables conduct electricity?" through a simple experiment.
You will need the following things for the experiment:
· A large size healthy and fresh potato
· A zinc plate (may be derived by stripping off the outer cover of a dead dry cell and cutting it into a thin small strip)
· A copper plate ( you may use a thick copper wire instead, retrieved from an old transformer or from some other source as desired, the more surface area it carries, the better)
· A red LED and wire assembly (as shown in the diagram)
· A couple of alligator clips
The following steps will easily help you to understand how to make a potato battery:
· Begin by cleaning thoroughly the zinc and the copper metal. It is best done by scrubbing them with an emery paper. Make sure the metals are as clean as possible, free from any external enamel, oxidization or dust particles.
· Carve out their other ends into pointed or sharp terminals.
· Now, holding the potato firmly into your left palm, cut through and dig into the pulp of the potato using the sharp ends of each of the metal so that they get fixed into the potato firmly. Make sure that the metals are separated by sufficient distance so as to include maximum amount of pulp in between them.
· Take a digital multimeter, set it to the millivolt range.
· Now connect the terminals of the digital multimeter across the copper and the zinc strip. You will be surprised to see a nice little potential difference of at least 0.4 volts developed across them.
· But using just one potato assembly you won't be able to power an LED because the minimum forward voltage of an LED (red) is around 1.5 volts.
· The above criteria can be easily fixed by making 3 more such potato assemblies and then connecting them in series as shown in the diagram. Ultimately you should be left with a single free copper strip on the first potato and a single free zinc strip on the last potato.
· Once you have finished preparing four of the potato circuits, make an LED wire assembly by connecting (preferably by soldering) two pieces of short flexible wires to the LED terminals.
· Also connect the alligator clips to the other free ends of the wire.
· Now simply attach the alligator clips (cathode to zinc, anode to copper) to the two free metal electrodes of the first and the last potato.
· You should be immediately able to witness a nice glow on the LED. If possible take the whole assembly to some dark corner of your house to see the illumination more distinctly. The glow may not be sufficiently bright as this potato battery is too primitive in its design and is able to produce power just enough to make the LED glow. Preferably you may try lemons in place of potatoes to get better results, since acidic electrolytes (lemon juice contains citric acid) are ideally suited to generate electricity in the above manner and produce more efficient results.
Hopefully the above experiment helped you understand how and why fruits and vegetables conduct electricity.
How many single phase can you run on a 100amp 3 phase?
You can divide a three phase service into (3) single phase circuits providing you have a 4th neutral wire.
How do you calculate starting current of 380 volts 3phase 50 hertz AC motor?
Dear Sir,I want to know that how much draw starting current of 380 volts 3 phase 50 hertz AC motors as per rating values?
230V single phase 2 wire should be assumed to have two hot wires?
Yes it should. Each wire with reference to ground will have a potential of 115 V and obviously 230 V between the two. The neutral in your system is a tap taken off the middle of the winding between your two main conductors. So again yes they will both be hot and should be de-energized if any work is being done.
well obviously if you open it you will find out
Will a alarm still work if power lines and telephone lines are knocked down?
Fire alarms and burglar alarms have a secondary power source such as a battery or generator, so they will continue to report alarms for a time after loss of utility power.
They also usually have two separate means of reporting the alarm. Sometimes this is accomplished with two separate phone lines. In this case if both lines are down, the panel will not be able to report an alarm. More and more alarm panels, however, are using radio communication such as cellular, as the second or backup communications path. These panels would still be able to report the alarm if telehone lines are down.
What the damages would happen if you did not use Antistatic Wrist Strap?
Possibly nothing. But also possibly destruction of sensitive components. If you're working on something that specifies a wrist strap, why not use one? It's only a few bucks. ----
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.)
What AWG cable for 200' x 208 volt three phase 250 amp circuit?
A wire size of 250 MCM will limit the voltage drop to 3% over a distance of 200 feet.
Check for a blown fuse in one of the phase legs.
Why should you not use an iron rod to push a live wire?
Iron rod is a conductive material. You will get electrocuted if you touch a live wire with any conductive material like iron rod. It could be fatal to do so.
What does it mean when voltage and resistance are in phase?
The voltage across a resistance is in phase with the current through the resistance because the resitance in non-reactive, i.e. non-inductive and non-capacitative.
In the inductive case, the load resists a change in current. In the capacitative case, the load resists a change in voltage. In the resistive case, the load current follows the voltage with no delay, hence there is no phase differential.
How do you reset my citizen's eco-drive model no e 87?
set the watch setting to Local Time then set the crown to position 2
What is the Largest amperage single phase 120 volt breaker made?
6000amps
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The above answer must have big lugs to accommodate 6000 amp capacity wire.
In my breaker catalogue the largest 120 volt single pole breaker is 70 amps, 277 volt single pole is 150 amps and 347 volt single pole is 100 amps. The 120 volt single pole breaker occupies two opposed slots because of its length.
