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Electrical Wiring
Ask questions here about proper wiring and electrical installation here.
4,935 Questions
What happens to the power if the resistance of a circuit doubles and voltage remains the same?
the power will be reduced to the haflf because P=V2/R so when the resistance doubles the power reduced to the half of itsoriginal value
What is the Difference between 380 and 440 v?
b/c if voltage decreases therefore the current is increases
due to p=v*i & hence if current is increases therefore the
magnetic flux will also increases & hence there is good
magnetic strength will occurs
It is the requirement of the machine.we can either operate
in 440 or 220 or even in 110 volts.The voltage depends upon
the motor,circuit and other loads related with the machine.
What is a switch in a circuit?
A switch is a non automatic mechanical device capable of opening or closing a circuit under normal load conditions
Increasing the capacitance of the coupling capicitor in an RC coupled amplifier has what effect?
the circuit will pass waves of a lower frequency
What is the function of the inductor in a fluorescent tube light circuit?
Without an inductor in series with the tube, the plasma in the tube would simply short-out the service wires. That would always cause the circuit's protective fuse to blow - or its circuit breaker to trip - to cut off the supply of current to the tube. If that happened the tube light would never be able to perform its intended purpose, which is to continue running - and giving out a continuous light - for long periods of time.
So a high-inductance choke must be used in circuit with the starter and the tube for two reasons:
- firstly the choke generates a high voltage pulse across the tube when the starter's contacts open. That pulse causes the gas in the tube to ionise and become a low-resistance plasma
and
- secondly, because it is wired in series with the tube, the choke greatly reduces the current drawn by the tube once it contains the low-resistance plasma.
The starter is a special kind of switch: its contacts are made of a metal alloy which heats up and bends soon after a voltage is applied, causing the switch contacts to open.
Can you put 480 volts on motor wired for 230 volts?
It depends on the device, if for instances the machine is a pc, laptop mobile phone charger or anything that has a modern switch mode power supply built into it then you can use it on anything between 110 and 240, it will auto select, i don't recommend attaching a machine that is rated at 240v to a 460v supply, you will need to contact the manufacture to determine operating parameter's.
It is number 4 copper wire that is generally equivalent to number 2 aluminum wire as regards its ability to handle current. Voltage is not an issue with the conductor but, rather, with the insulation. The length of the run is immaterial ifthe original wire size for aluminum was correctly specified for the application. Think this through and it should make sense. Note that if you are considering an upgrade from aluminum to copper, you would be wise to do just a bit more research. Freelancing in electrical work without knowing all the facts can result in property damage from fire. Death is also a possibility, either from the effects of the fire, should one occur, or from electric shock. These eventualities can result from even the most simple mistakes in a job like this. Do all your homework before proceeding, and talk to at least two electrical contractors before strapping on your tool belt. Show everyone how smart you are and hire the job out to a qualified professional if you even think you have any doubts about what is involved in the undertaking.
What difference between a kilovoltampere and kilovolt?
Kilo simply means 1000. Volt-ampere (VA) is a measure of power, similar to the watt. Volt is a measure of voltage, or electrical pressure. Voltage means electricity is available, but unless it is actually used, no current (amperes) flows, and no work (power) is done. Suppose you have a motor that needs 1000 volts to run, and when it is on it draws one ampere (amp) of current. We would say the motor supply voltage is one kilovolt. When the motor is running, we would say it uses one kilovolt-ampere (1KVA) of power (1 ampere * 1000 volts = 1000 VA or 1 KVA).
What are some electromagnetic devices?
electromagnetic devices are devices that work on electricity but are magnetic
What are IEE regulation in wiring?
BS7671:2008 Requirements for Electrical Installations: IEE Wiring Regulations, 17th Edition. Strictly speaking, this document is published by the IET -the Institution of Engineering and Technology, as the IEE (Institution of Electrical Engineers) no longer exists.
What cause electrical shock volts or amps?
They both do. Voltage is a measure of electrical pressure. Amperage is a measure of electrical flow (current) (amount of electricity flowing). High voltage by itself will not kill you but will leave a nasty taste in your mouth. At the right pressure your heart can be stopped though by a single amp.
What is the amp rating for a 208 Volt 100 VA transformer?
Is 120 V the primary or secondary voltage? If the primary (input) voltage is 120, then at full load the transformer will draw about 0.42 A from the line, and the current delivered to the load depends on the secondary (output) voltage. If the secondary (output) voltage is 120, then at full load the transformer will deliver about 0.42 A to the load, and the current drawn fom the line depends on the primary (input) voltage. amps = watts / volts So, for instance, if your transformer has a 120 V primary, and a 24 V secondary, as you might find in your AC unit or furnace: Primary current (at full load) - A = W / V A = 50 / 120 A = 0.4166 Secondary current - A = 50 / 24 A = 2.08
What happens when a high AC voltage is used on a low DC voltage motor?
Depending on the type of DC motor, it will either run normally or just heat up and make noise.
i think the motor will rotate to and frow.means it will rotate in clycle.it will complete half cycle.and after it will complete its other half cycle in anticlockwise direction.
What are the disadvantages of single phase electricity?
Single-phase power transmission requires a live and a return wire, so power is lost due to current flowing through two wires for each (there is one) driving EMF.
If you add two more at 120 and 240 degrees (one and two thirds of a period), then you get three-phase power. Now, the sum of all currents at either end is zero. When one phase's voltage is high, the resulting current travels down that conductor and returns via a combination of the other two; but these other two currently have a voltage causing that exact same current (split in varying proportions between them) to flow, meaning this current can be considered not to be a "return" of the first phase. You could consider it getting a return conductor "for free".
Where do you find the wattage rating of a light bulb?
On the end of any light bulb except for the fluorescent type there are numbers on the end of light bulb. The number will be followed by the letter w I.e.(65 w). W represents watts-amount of power used. On fluorescent light bulbs the curly cue ones it will be around the base where it screws into the socket.
What wire size is needed for 30 amp load for 200 feet?
The minimum wire size for a 30 amp load is 10 gauge copper or 8 gauge aluminum. Assuming a 120VAC circuit and to maintain a maximum 3 percent voltage drop from load to panel, upsizing to 4AWG wiring would be the best selection for this circuit.
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An accurate answer can not be given because the type of system has to be stated. Single phase or three phase and a voltage also has to be stated to be used in the calculation for sizing of the conductor.
A #8 copper conductor will limit the voltage drop to 3% or less when supplying 30 amps for 150 feet on a 120 volt system.
What is the amperage draw of a 3 H P submersible pump motor 230 volts single phase?
The current should be listed on the motor nameplate as FLC or FLA (full load current/full load amps). Starting current is listed as LRC (locked rotor current). However, to calculate current for any load, divide watts by voltage. 1 hp = 746 watts 85 hp = 63410 watts 63410 watts / 208volts = 304.85 amps 63410 watts / 480 volts = 132.10 amps
Can 3 phase power and single phase be ran in the same conduit?
Yes they can. There are regulations that cover most jurisdictions regarding how different cables can be contained. It is important that you are knowledgeable about your local requirements before starting the work.
What is a conductor and what is the use of it?
The root word comes from the Latin, and means 'to lead'. The 'duct' part is the 'lead' part, and we meet it in conducive, conduct, duct, ductile, and so on.
Conductors are used to transfer energy or a material from one place to another. We have conductors for heat, sound, vibration, electricity, and so on.
A word with the opposite meaning is 'insulator'.
How are the safety devices in an electrical circuit connected?
Heaters,Electric blankets,clothes dryers,stove ,oven,cook top,
Hot water cylinders,Plugs,Multi-boxes,Lighting,Cords and leads,small-appliances,What year was the steam boat introduced?
1543 is the date given for a paddle steamer said to have been devised by Blasco de Garay in Spain, a myth that is now well discredited.
In 1787, John Fitch built the first recorded steam-powered boat in the United States. He experimented with side-mounted paddle wheels, but in 1791 used and patented oars instead.
The first successful application of steam power to navigate a paddle wheel boat in North America occurred in 1793 when Samuel Morey demonstrated his steamboat on the Connecticut River near Orford, New Hampshire. Fulton presents his steamship to Bonaparte in 1803.
Robert Fulton was the first to operate steamboats commercially. Fulton may have become interested in steamboats at the age of 12 when he visited William Henry during a trip to Britain and France in 1777. He built and tested an experimental steamboat on the River Seine in 1803, and was aware of the success of Charlotte Dundas. Before returning to the United States, Fulton ordered a steam engine from Boulton and Watt, and on return built what he called the North River Steamboat (later known as Clermont). In 1807, she began a regular passenger service between New York City and Albany, New York, 240 km (150 mi) distant, which was a commercial success. She could make the trip in 32 hours. In 1808, John and James Winans built Vermont in Burlington, Vermont, the second steamboat to operate commercially.
In Canada, in 1809, PS Accommodation, built by the Hon. John Molson at Montreal, and fitted with engines made by the Eagle Foundry, Montreal, was running successfully between Montreal and Quebec, being the first steamboat on the St. Lawrence. Unlike Fulton, Molson did not show a profit. Molson had also two paddle steamboats "Swiftsure" of 1811 and "Malsham" of 1813 with engines by B&W. The experience of these vessels, especially that they could now offer a regular service, being independent of wind and weather, helped make the new system of propulsion commercially viable, and as a result its application to the more open waters of the Great Lakes was next considered. That idea went on hiatus due to the War of 1812.
How many 14 gauge electrical wires can you put in a 2x4 electrical box?
Answer varies. Is it a deep or shallow box? is there a receptical, a switch in the box as well? is it just a junction box? are they single wires or NM cable?
How do you know the voltage of a 3 phase panel box?
A 277/480V box should be clearly marked, but not always. The only way to be certain of a box's voltage is to use a voltmeter on it. This type of voltage is very dangerous. When voltages start to get this high, at best you may loose a finger or limb, at worst, you die. I recommend calling an electrician, who will be able to safely check this out.
