we know for completing the circuit neutral has to be connected(single phase). but why there is no current in neutral wire. why neutral wire is required even earthing will provide the potential difference with respect to phase.
Why Does the Tube Light in My House Use So Much Voltage?!
i have noticed in my house that a tube light requires more voltage for working than other appliances like fan, even computer and tv..... is my observation right??? if so watz the reason behind it??? whenever Air conditioner is switched on fan , tv and computer works but tube light doesnt get to ligh
DIY Capacitor
I'd like to know how much energy (watt-hours) can be stored in a capacitor made from two rolls of aluminum foil. The foil is the kind one buy's at a restaurant supply. The ones I have are 18"x500ft x about .001 inches thick. If I rolled two of these together with a dielectric between them and anothe
Herschel Gets Sneak Peak at Star Birth
The first scientific results from the Herschel infrared space observatory are revealing previously hidden details of star formation. New images show thousands of distant galaxies furiously building stars and beautiful star-forming clouds draped across our Milky Way galaxy. One picture even catches an "impossible" star in the act of formation.
Presented today during a major scientific symposium held at the European Space Agency in the Netherlands, the results challenge old ideas of star birth, and open new roads for future research. The mission is led by the European Space Agency with important participation from NASA.
"Herschel is a new eye on a part of the cosmos that has been dark and buried for a long time," said the mission's NASA project scientist, Paul Goldsmith, at NASA's Jet Propulsion Laboratory, Pasadena, Calif.
Herschel's observation of the star-forming cloud RCW 120 has revealed an embryonic star, which appears ready to turn into one of the biggest and brightest stars in our galaxy within the next few hundred thousand years. It already contains eight to 10 times the mass of the sun and is still surrounded by an additional 2,000 solar masses of gas and dust from which it can feed further.
"This star can only grow bigger," says Annie Zavagno, Laboratoire d'Astrophysique de Marseille in France. Massive stars are rare and short-lived. To catch one during formation presents a golden opportunity to solve a long-standing paradox in astronomy. "According to our current understanding, you should not be able to form stars larger than eight solar masses," says Zavagno.
Read more at http://www.esa.int/esaCP/SEM7N7KPO8G_index_0.html.
Herschel is a European Space Agency cornerstone mission, with science instruments provided by consortia of European institutes and with important participation by NASA. NASA's Herschel Project Office is based at JPL. JPL contributed mission-enabling technology for two of Herschel's three science instruments. The NASA Herschel Science Center, part of the Infrared Processing and Analysis Center at the California Institute of Technology in Pasadena, supports the United States astronomical community. Caltech manages JPL for NASA.
View my blog's last three great articles...
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Engineers Diagnosing Voyager 2 Data System
This artist's rendering depicts NASAs Voyager 2 spacecraft as it studies the outer limits of the heliosphere - a magnetic 'bubble' around the solar system that is created by the solar wind. Image credit: NASA/JPL-Caltech. › Larger image
Engineers have shifted NASA's Voyager 2 spacecraft into a mode that transmits only spacecraft health and status data while they diagnose an unexpected change in the pattern of returning data. Preliminary engineering data received on May 1 show the spacecraft is basically healthy, and that the source of the issue is the flight data system, which is responsible for formatting the data to send back to Earth. The change in the data return pattern has prevented mission managers from decoding science data.
The first changes in the return of data packets from Voyager 2, which is near the edge of our solar system, appeared on April 22. Mission team members have been working to troubleshoot and resume the regular flow of science data. Because of a planned roll maneuver and moratorium on sending commands, engineers got their first chance to send commands to the spacecraft on April 30. It takes nearly 13 hours for signals to reach the spacecraft and nearly 13 hours for signals to come down to NASA's Deep Space Network on Earth.
Voyager 2 launched on August 20, 1977, about two weeks before its twin spacecraft, Voyager 1. The two spacecraft are the most distant human-made objects, out at the edge of the heliosphere, the bubble the sun creates around the solar system. Mission managers expect Voyager 1 to leave our solar system and enter interstellar space in the next five years or so, with Voyager 2 on track to enter interstellar space shortly afterward. Voyager 1 is in good health and performing normally.
"Voyager 2's initial mission was a four-year journey to Saturn, but it is still returning data 33 years later," said Ed Stone, Voyager project scientist at the California Institute of Technology in Pasadena. "It has already given us remarkable views of Uranus and Neptune, planets we had never seen close-up before. We will know soon what it will take for it to continue its epic journey of discovery."
The original goals for the two Voyager spacecraft were to explore Jupiter and Saturn.
As part of a mission extension, Voyager 2 also flew by Uranus in 1986 and Neptune in 1989, taking advantage of a once-in-176-year alignment to take a grand tour of the outer planets. Among its many findings, Voyager 2 discovered Neptune's Great Dark Spot and 450-meter-per-second (1,000-mph) winds. It also detected geysers erupting from the pinkish-hued nitrogen ice that forms the polar cap of Neptune's moon Triton. Working in concert with Voyager 1, it also helped discover actively erupting volcanoes on Jupiter's moon Io, and waves and kinks in Saturn's icy rings from the tugs of nearby moons.
Voyager 2 is about 13.8 billion kilometers, or 8.6 billion miles, from Earth. Voyager 1 is about 16.9 billion kilometers (10.5 billion miles) away from Earth.
The Voyagers were built by JPL, which continues to operate both spacecraft. Caltech manages JPL for NASA.
For more information about the Voyagers, visit: http://voyager.jpl.nasa.gov/.
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Feels Like Summer on Florida Beaches
The unusually cold winter is but a memory now as the heat and humidity take over. Not as hot as July and August, but getting closer day by day. We went for an evening walk on Pass-a-Grille beach Friday evening and enjoyed the sunset. I couldn’t help but think about the big glob of oil [...]
Tahiti Travel Tips
It's not hard to tour Tahiti and French Polynesia independently, but this is an expensive destination, and to save money you've got to be prepared to cut corners at times. Here are a few strategies and tips.
Minority Village Homestay
On Friday morning as I returned to my room from my free breakfast I was beconed by a friendly face. Sylvia from Holland had just arrived on the night train and wanted to know whether the guesthouse was any good. We started to chat and after she learnt that I was off at 9.30 that morning on a one night two day homestay she decided she wanted to come as well. We made the arrangements and then we we
Bac Ha Market
Sunday is market day and I had read wonderful things about the Bac Ha Markets where eight different minority tribes gather in traditional dress to sell their wares. We had to leave at 7.30am and the three hour drive caused me considerable discomfort as it wound its way up down around and through many mountains. Luckily I wasn't bus sick but when we arrived we plunged straight into market busines
booked hotels
We have booked our hotels for a week in Bangkok a week in Chiang Mai which will give us time to look around for a condo to rent for 2 months longer in Chiang mai. Can't wait
Franz Joseph Makarora Queenstown Christchurch Kaikoura
WOW I have done so much since I last wrote on my blogThe day after the glacier hike 4 of us got picked up from the hostel early and went to another glacier just down the road called fox glacier. There lauren 2 instructors and I got into a very small plane and made our way up. We flew right past Mount Cook and Mount Tasman which are the first and second highest mountains in New Zealand t
Hanoi Tears
Backing up a bit for a second. I shared my train compartment with three Vietnamese men. I arrived soaked to the bone and of course I was a sight for sore eyes. I took their laughter and staring with good humour. The only advice Dad gave me before I left was to use and trust my instinct. I have tried to do this every day but I have often been wrong. My instinct told me that I didn't want them to cl
Onwards to CapeTribulation and the Bloomfield Track
Today we left Port Douglas and drove to Cpae Tribulation. On the way we stopped at Mossman Gorge I had read it was a good place for a swim and it really was beautiflul the problem was neither of us had our swim stuff with us so we just rested on the rocks for a while and watched everyone else enjoying the fresh cold water.Cape Tribulation is in the Daintree National Park which is one of the olde
"It’s been 6 whole months since that I have left your home…" ‘Welcome to Paradise’ Green Day
Kia OraWell today is the exact 6 month mark of landing in Aotearoa and what a ride it's been but now it appears to be winding down.I distinctly remember at Christmas my rather drunken friend Andrew going on some big ramble about life the universe and everything but there was one bit that stuck out and moved me. For all his Yankee idiocy he managed to rather profoundly state that we are all h
Adrian Maelzer Blog
Adrian it seems your fame has reached the winlderness of Australia except maybe the spelling is not quite right....
Big trouble in Little Comayagua…
The hunt begins...Missing out on the first week of a 7 month rtw trip in reality isn't that bad in the long run. But what made it worse for us was the fact that we had prepaid for a 17 day tour through central america which started while we were stranded in London. Therefore every day we remained in London waiting for the infamous ash cloud to surrender the skies we were missing out on a holid
San Gil Damien Rice and rain
My last couple blogs have been long so Im going to try to keep this brief.We arrived finally in San Gil on Friday night. IWe checked in a hostel called Hostel Santander Aleman. Its very nice we have a private room and shared bath and the owner is super nice and helpful. It was late when we got there so we didnt do anything except grab dinner in an Italian restaurant. The next day y
Sapa arrival
Yes Sapa was everything I wanted it to be. Rolling hills relaxed small time streets colourful women wearing traditional clothes and clean fresh mountain air I caught the night train from Hanoi to Lao Cai last Monday night. It wasn't so bad but I was glad that I had nearly a week before I had to do it again as it takes alot out of you. You are constantly waking up as things lurch and bang and
Monterey to San Francisco
I got up in the morning ate a breakfast of cheese and fruit then decided to look for a place to rent kayaks at my friend also met through LOTRO Matt's recommendation. Headed down to cannery row and found a place right by the breakwater Adventures By the Sea 30 all day deal I went out for a few hours and pretty much decided I wanted to go as far as I was allowed which was to the big point on
San Diego
Some of us were up at 545 this morning showered packed up and car loaded others eventually surfaced at 7am By 745 we were saying our farewells to Keith and Sylvia and on our way to our next state. We had to stop down the road to collect the tubing pictures and then start our 6 hour journey. We left with the roof down thinking we would probably have to put it up at some point.2 hours in we s