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Why was the mains in the voltage changed from 240 volts to 230 volts a few years ago?
The change from 240 volts to 230 volts in mains voltage was implemented to align with European standards and ensure consistency across member countries. This adjustment was made to improve energy efficiency and safety while harmonizing electrical regulations within the European Union.
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How many times has earth's magnetic polarity changed?
The Earth's magnetic polarity has changed multiple times throughout its history. These changes, known as geomagnetic reversals, have occurred hundreds of times over the past 100 million years.
What is the voltmeter reading?
ANSWERI asked my husband who's an electrician and he say's a voltmeter does what it say's it measures "volts".ANSWERVoltage is the potential difference between two points, thus a volt meter must be referenced somewhere (ie one probe connected to some location for comparison, often ground). You can think of voltage as the desire of electricity to flow. If you use a volt meter and measure an unused wall socket, you will read ~120 volts (AC, RMS), but there is no current (except the very small amount flowing through your meter), thus no energy (energy = power = voltage * current) is flowing from unused outlets.A volt meter does not measure energy, it measures potential difference, or voltage.ANSWER[it is a WikiAnswers violation to delete a technically accurate answer so that you can substitute your own]OK, what we've got here is information being expressed at different levels of understanding and usage.(1) An electrician only needs to know that his voltmeter measures something called "volts", without being concerned what "volts" means. If his voltmeter reads 117 volts here and 235 volts there, he knows whether or not the circuitry is working properly.(2) A person reading a school textbook is going to be subjected to oversimplification, creative use of langauge and analogy rather than technically correct facts, easily misinterpreted partial truths, and the occasional totally incorrect information. When people start ascribing human characteristics like "desire" to electrical circuity, and use outdated or generic words like "electricity", you know they are operating at that middle school or high school level textbook level.(3) A scientist or engineer needs to understand what is going on at a level of mathematical accuracy and within the accurately integrated framework of the International System of units and quantities. There is no le Systeme International quantity called "desire", and energy most certainly does not equal power. At this 3rd level of understanding, the language is constrained by information that conform to the internationally agreed-upon set of standards that we consider to be"scientific fact".At this 3rd level of understanding, there are 2 competing but equally rigorous and correct systems for describing "electricity"; the 2 systems vary only by including or not including time as a factor. The system that does not include time is more fundamental, getting right down to the sub-atomic physics that drives electrical phenomena, so I prefer it. Let us call it FS for fundamental system. The popular le Systeme International includes time and is more likely to be encountered in textbooks of physics and engineering. It is almost always called SI.So what does a voltmeter measure? FS explanation: As charge (measured in Coulombs) moves through a circuit, it must be driven by energy (measured in Joules). Voltage (or Potential Difference) is a measure of the amount of energy driving the charge at any point in the circuit. Voltage = energy/charge = Joules/ Coulombs=Volts.The voltage always has to be measured between 2 different points in the circuit, so your voltmeter is telling you the difference between the energy levels at those 2 points. In order to read the energy levels, the voltmeter has to have a tiny amount of the charge move through the voltmeter; that's a critical understanding! The voltmeter can only read the energy difference by sampling some of the flow of charge. Having done that, your voltmeter can tell you in Volts the amount of energy driving the charge between the 2 points you selected.So what does a voltmeter measure? SI explanation: As current (measured in Amperes) moves through a circuit, it must be driven by power(measured in Watts). Voltage (or Potential Difference) is a measure of the amount of power driving the current at any point in the circuit. Voltage = power/current= Watts/Amperes=Volts.The voltage always has be measured between 2 different points in the circuit, so your voltmeter is telling you the difference between the power levels at those 2 points. In order to read the power levels, the voltmeter has to have a tiny amount of the current move through the voltmeter; that's a critical understanding! The voltmeter can only read the power difference by sampling some of the flow of current. Having done that, your voltmeter can tell you in Volts the amount of power driving the current between the 2 points you selected.The only difference between the two explanations, as I said, is a time factor. Power is the energy delivered per second of time. Current is the charge flowing per second of time. So when you compare Power and Current, it is mathematically and physically identical to comparing Energy and Charge. The time factors cancel out and you're left with only a language difference.If a circuit is energized or powered, as a convention we say that the operative voltages exist even though there is no charge or current flowing and the voltages are theoretically infinite. This is in recognition that the energy or power is instantly accessible whenever a load is introduced into the circuit.
Name a scientific theory that has changed?
The theory of continental drift has changed over time. Initially proposed by Alfred Wegener in the early 20th century, it was met with skepticism. However, over the years with advancements in technology and research, the theory evolved into plate tectonics, which is widely accepted today.
Why has the model of the Atom has changed over the past 200 years?
The model of the atom has changed over the last 200 years due to advancements in technology and the discoveries made through experiments. Scientists have been able to probe deeper into the structure of the atom, leading to the development of new models that better explain its behavior and properties. Each new model builds upon the previous ones, incorporating new evidence and modifying our understanding of the atom's structure.
How many volts of energy can a supernova produce?
A supernova can release up to about 10^46 to 10^47 volts of energy, which is equivalent to the energy output of billions of stars over their entire lifetimes. This immense amount of energy is generated in a matter of seconds during the explosion phase of a supernova.
What is the voltage of a john Deere lawn tractor battery?
If it is a model from the last fifty years it is a 12 volts battery.
Why do you have 110 volts but no 240 volts?
The availability of 110 volts versus 240 volts in a given location depends on the electrical infrastructure and standards in place. 110 volts is a common voltage used for standard household outlets in many countries, while 240 volts is more commonly used for high-powered appliances like dryers and stoves. If you have 110 volts but not 240 volts, it may be that your location is not equipped to provide higher voltage for specific appliances.
Why was the mains votage changed from 240 volts to 230 volts a few years ago?
This probably refers to the UK which used 240 v until the UK joined the European Community. Europe has always used 230 v so the solution adopted was to redefine the UK supply as 230 v, but no actual changes were made to the supply except to widen the allowed range of voltages. In the UK the nominal voltage range is 230 v -6% +10%, a range of 216.2 to 253 volts, which accomodates the almost universal 240 v supply in the UK. In practice the only appliances that are highly sensitive to voltage are incandescent bulbs (including halogen), and these are marked 240 v.
Can you plug a 220V appliance into a 230V outlet?
Assuming United States: 110=115=120 volts 220=230=240 volts The numbers have changed over the years, but now services are typically 120v or 240v. Anything listed for 10 volts one way or the other is designed for those voltages.
Why battery voltage is maintained at 12V?
It has become the standard and has been so for over 50 years. It was 6 volts in up until the late 50s.
What is the charging system output on a 2000 Harley Davidson Electra Glide?
It can't be more than about 15 amps. I have had my bike for 8 years and it has always dropped down to about 10.5 - 11 volts on the voltmeter at idle which isn't right. The voltage at the battery is more like 12.2 volts at idle. When you rev it up, the voltage eventually gets up to about 14 volts. I have replaced both the battery and the regulator. I think the stock alternator is too small for the load.
What are the best LED replacement bulbs?
It really depends on where you are going to use the bulbs!All the light bulbs do not operate the same voltage for starters, there would be nothing surprising about that, but unless you are aware of the differences between them you could be in a little shock. LED bulbs come in two primary voltages: mains voltage and low voltage.Mains Voltage BulbsThe mains electricity supply in the United Kingdom is 230 V Ac (Alternating Current). This is used to supply the majority of domestic and commercial lighting.LED (Light Emitting Diodes) operate at low voltage DC (Direct Current). As such, LED bulbs that are designed to run straight off the mains, like GU10, B22 or E27, require a driver to change the voltage from 230 AC.You will observe about GU10 LED bulbs (230 V) is that they are slightly longer than the low voltage MR16 bulbs(12 V). This is due to the fact that the driver unit is placed into the GU10 fitting.Low Voltage BulbsLow voltage bulbs, are simply lights that run at a lower voltage than provided by the mains electricity supply. They used to exist in the cars where connecting to the mains electricity supply was not viable and the lights would have to run off either a 12V or 24V engine battery instead.Low voltage lighting in houses is a recent innovation. It is created primarily for fittings in kitchens and bathrooms. Instead of being connected directly to the mains supply, an intervening transformer 'steps down' the mains voltage.When you exchange your old halogen bulbs for MR16 LED, there is no guarantee that they will work with your existing 12 V transformer. Contact your retailer to determine whether or not you need to upgrade your system.LED lights have come a long way in the last few years and so have the prices so keep looking. Any good LED lighting website will have info on which lights are best for the application you need them for so have a look around.
What voltage setting should be used when charging a motorcycle battery?
12 volts is the standard and has been for many years. In the past, some motorcycles and especially scooters and small bikes had 6 volt batteries.
How do you convert 5 volts to 12 volts?
The 12 v side ampere rating is unnecessary information (You need 5 watts output power, so if the input is 12 volts, you need around 1/2A input current). Use a DC to DC converter. I found an IC made for this purpose at Radio Shack several years ago - I assume they are still available if you are a hobbyist. Otherwise you can buy premade ones (search for 12v to 5v converter).
What voltage of electricity is in a plug?
Assuming that you mean a mains plug, then the voltage across the live and the neutral pins depends entirely on the the supply coming in to the socket. North America is rated at 110V while in Europe, the standard voltage is 230V. All supply comanies are allowed a tolerance of a few percent either higher or lower than the rated voltage. However, on a project I worked on in Eastern Europe some years ago, I monitored the voltage and although it was supposed to be 220V in that particular country, what I saw was between 156V and 250V. So, even if you know what the voltage, should be, you can never rally be sure!
Can you plug in a 115 amp welder into a 110 volt outlet?
yes. 110,115,120,125 and even 130 volts are all in the same catagory. as power companies increased their output voltages through the years, 110 became 115, then 120, and so on. when buying light bulbs, look for the 130 volts on the bulbs data. not wattage, voltage. they will last far longer than 115,120 volts
Will touching a 220 volt wire cause cardiac arrest?
Not necessarily, I have been electricuted at 240 volts at 11 years old and did not suffer Cardiac Arrest. I have seen workers being hit at 50,000 volts and not suffer CA, but received major burns and hospitalization and out of work for 3 months. It's the current not the voltage that kills you. 10 milliamperes or .1amp can.
