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Electrical Wiring
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4,935 Questions
How do you convert 50hz to 60hz?
Nowadays converting an electricity service from 50 Hz to 60 Hz can be done by using an expensive electronic invertor unit. Before such units became available you would have to install an even more expensive motor-alternator set which was very large, heavy and noisy.
Some small portable 50 Hz appliances - such as electric shavers, battery chargers for cell-phones, cameras, music and video players, laptop or netbook personal computers, etc. - have been designed to run safely on different supply voltages and frequencies. Whenever that is so, it should be clearly stated on the appliances' rating-plates. In many such cases, where the power needed is low, say less than 30 Watts, a cheap and simple "International Travel Socket Adapter" is all that is needed to make the appliance plug-in and work. Many international airports have shops selling such adapters.
If the power needed is higher (such as for an electric kettle, a fridge, a freezer, a washing machine or a dryer) instead of paying a lot of money for something to convert the available service frequency from 50 Hz to 60 Hz it is much more economic to buy - either new or secondhand - an appliance that has been designed to run on 60 Hz.
For more information see the answers to the Related Questions shown below.
CommentElectric kettles are unaffected by frequency of course, but US-marketed 60-Hz appliances, such as fridges, freezers, washing machines, etc., have been regularly used in places such as the UK (e.g. on US air bases, as well as privately) using a suitably-rated transformer. For example, I used a 230-V 50-Hz washing machine in Canada (60 Hz) for several years, and a large 120-V 60-Hz fridge in the UK for several years, without any damage to either appliance. So, while it would be more economical to buy a new appropriate voltage/frequency appliance in the country in which it is to be used, it also makes economic sense to make use of your existing appliances instead if you decide to ship them.
What is the purpose of the Unijunction Transistor?
A Unijunction Transistor is a transistor that acts solely as a switch.
Why did Michael Faraday invent Dynamo?
One history programs told how electricity was discovered and devices built to produce it but no one knew what to do with it. So, it became a like a play thing for rich people at parties and such. Seriously. It is similar to the demonstrations that they give at High Schools to amaze the students.
Would a 15 kva 380 volt generator be big enough to run a house with a 60 amp breaker 380 volts?
A 15 KVA - Generator operating at 380 Volts can cater to only 22.79 Amps. It cannot cater to a 60 Amps breaker
What are some major ict inventions?
ICT INVENTIONS:
- laptop
- keyboard
- computer
- typewriter
- Internet (world wide web)
- telegraph
- google/bing/ask
- telephone
What is function of breather and explosion vent of 3 phase transformer?
breather to observed moisture from the tank and explosion vent will works when the moisture will get observed in the tank then it will explodes from the explosion vent by breaking diaphgram
AnswerThe breather allows air to enter and leave the transformer's sealed tank as the transformer oil contracts or expands. The breather is fitted with a silicon-gel chamber to ensure that any air entering the tank is dry. A viewing portal allows the viewer to determine whether the silicon gel crystals are still active.
The explosion vent is a large-diameter tube, usually located at the top of the transformer tank, sealed with a frangible plate or diaphragm. Should an explosion occur within the transformer due, for example, to a catastrophic short-circuit fault, then the blast of the explosion will be allowed to escape through the explosion vent, rather than causing the transformer's tank to explode.
Does a 3 phase motor require a special electrical panel in a new home wiring?
Yes.
But more than that, it would require s separate line from the power company. Three phase power is not normally available in residential areas.
Choices;
- Pay the power company to a install a dedicated transformer and bring a line in from the nearest 3 phase circuit. Very Expensive
- Buy a Phase Converter. Expensive
- Rent a warehouse that has 3 Phase. Not Cheep
- Sell the 3 phase equipment on eBay and buy single phase. Best Bet
What is the difference between a transmission grid and an electricity grid?
The terms transmission grid and electrical grid are somewhat interchangeable. The electrical grid, or power grid, is the network used to get electric power from where it is generated to all the places that use it. The one difference might be that a transmission line or grid might be thought of as the network of high voltage long distance lines. These are used to move large amounts of power with minimal loss through the use of extremely high voltages. These long distance lines connect generation facilities with substations, and it is at the substation that the voltages are stepped down, and that power is then put on the electrical grid.
What does no load speed on a electric motor mean?
Generally a motor drives some equipment, it could be a fan, or a pump, connected to motor's shaft. The speed of the motor when no equipment is connected to its shaft is known as no load speed.
What does AFC mean on old radio?
Auomatic Frequency Control. Newer radios have it too. It's just not advertised and there is no longer a switch to turn it off like on the old radios.
Can copper speaker wire be spliced with silver speaker wire?
Yes, IF the rules of proper splicing are followed, dissimilar metals can be successfully spliced.
Some of those rules that I can recall at the moment include:
- The part of the wires to be connected by splicing MUST be clean and free of any grease, dirt, corrosion, or deleterious material.
- A "sound" mechanical connection MUST be made. That means either the wires properly twisted together, OR a mechanical device [connector, wire nut, or some type of terminal used].
- If a twisted mechanical splice is used, then the splice joint should be soldered to both "lock" the twisted splice, and to prevent the atmosphere from getting into the wire interface, causing corrosion which will degrade the current carrying ability of the splice joint.
Can you reverse feed a residential 2-pole circuit breaker?
Yes. This is the way small residential transfer switches connect the generator to the system. The breakers are bidirectional.
How to make a home yagi antenna to receive FM signals?
To cut a wire or aluminium tubing length for a dipole antenna take your frequency in Megahertz that you want to tune the antenna to and divide that number by 468. This will be the full wave length of the frequency you will be tuning to. For general purpose listening cut the antenna to mid frequency of the FM band. Cut this wire (or tubing) into two equal pieces. This will be the driven element feed point. For a yagi antenna cut a reflector 10% larger that the first cut and place it 1/2 wavelength behind the driven element on the boom. For the director cut the wire length (or tubing) 10% smaller that the driven element and place it on the boom 1/2 wavelength in front of the driven element. This will give you a three element yagi antenna.
How do you hook up a lemon battery?
To make a lemon battery you have to have . . .
1 lemon
2 wires(one red one blue)
3 a 10 volt battery
Hook up the wires to the lemon and then to the battery then turn it on and it should work.
See tutorial below for additional information .
Difference between two phase and three phase welding machine?
Three phase uses a safety circuit away from the machine, two phases uses you as the safety circuit
RCT is Secondary resistance of Current transformer it depends on Design.
Will a 115 volt converter from 240 volts harm a 110 - 120 volt appliance?
The appliaance is designed for 110-120 v so if it is fed at 115 v that is quite OK.
Can you buy just a circuit breaker?
Yes, you can purchase a circuit breaker just as you can purchase a wall switch. Big box home stores and hardware stores carry circuit breakers. You should know that they can be a bit expensive, and they are not returnable. Additionally, there are several different types of breaker, and if you have an older electrical panel, you might have to do a bit of calling around to locate a breaker that is made for that setup.
The last thing you need to know is that experimenting with electricity by tinkering with a home electrical distribution system can be fatal. Electric shock can kill the careless or less-than-knowledgeable do it yourselfer. Or an electrical fire can damage the home, and endanger anyone home at the time. Damage to equipment that is incorrectly wired is possible, but that pales compared to the other two hazards.
Replacing a breaker is not extremely difficult, but exposes the worker to hazards that must be managed. Opening the mains breakers to completely de-energize the panel busses is the smartest route. Naturally an exact replacement will have to be chosen, particularly as regards the trip rating. And if you're adding a breaker to a panel to accommodate a new circuit, you'll have to have done the math to insure that the panel is rated for the additional circuit. That's in addition to insuring all that the other wiring meets code and is done in a workmanlike manner.
Shortcuts or "amateur" work on electrical systems cause fires and can kill people. No judgment is passed, but the cautions cannot be overstated. A professional consultation is the best idea, and "experimentation" is discouraged.
Power is joules per second, also known as watts. You can calculate watts if you know volts and amperes by simply multiplying them together, because volts is joules per coulomb and amperes is coulombs per second - multiplying them gives you joules per second. It gets a little complex when you start talking about AC power, because current and voltage is not always in phase, but the principle is the same.
AnswerThere is no such thing as 'electric' power. Power is not a 'thing', it's a rate: the rate of doing work, or of heat transfer, expressed (as explained above) in joules per second which has been given the special name, the watt.
I'm sure this isn't what you want to hear, but you probably need to ask an electrician familiar with your service and what you want to connect.
As a general answer, you can connect a 240v line to line resistive load like an electric water heater to any 240v source. If you also need the 240v to have 120v line to neutral, like a 240v electric stove that contains a 120v clock and oven light, then its possible if the 3 phase power is connected in a "high delta" configuration, and you connect to the correct leads. If you have a high delta service and want to ignore the 3-phase power service and wire most or all of the loads in the building as a single phase load, the utility may have to be consulted.
It sounds like you need a variable speed drill. There was an item on the market a few years ago that you could plug your drill into and control its speed. I haven't seen one lately since most new drills have variable speed built into the drill. On a drill press all you need to do is move the drive belt to the smallest pulley on the motor and the biggest pulley on the drill spindle.
What is the use of 4-point starter in motors?
The four-point starter eliminates the drawback of the three-point starter. In addition to the same three points that were in use with the three-point starter, the other side of the line, L1, is the fourth point brought to the starter when the arm is moved from the "Off" position. The coil of the holding magnet is connected across the line. The holding magnet and starting resistors function identical as in the three-point starter. * The possibility of accidentally opening the field circuit is quite remote. The four-point starter provides the no-voltage protection to the motor. If the power fails, the motor is disconnected from the line.
