Which is more dangerous: AC or DC power?
DC can be defined as the ‘unidirectional’ flow of current. Current only flows in one direction. Voltage and current can vary over time so long as the direction of flow does not change.Lets assume that a certain battery provides 1.5 V, which can be described in graphical terms as:Electric charge in alternating current (AC), on the other hand, changes direction periodically. The voltage in AC circuits also periodically reverses because the current changes direction.*Plot of AC waveWhile considering which is more dangerous I hope you realize that 230 volts DC and 230 volts AC develop the same power in a resistor but they have different safety considerations. Its also known that 230 V AC is 325 volts peak, 650 peak to peak. So an AC supply can actually apply greater voltage than 230 volts DC.Plus the certain body facts like:-The human body works on electrical signals.-All the muscles are driven by generated signals.-When a source of sufficient voltage is applied the muscles work (contract).-Every articulation in the body is controlled by (at least) two opposing muscles. For example clenching you hands and opening them. In general one set is much stronger than the other (try it with clenching/un-clenching).-When a supply such as the mains is applied it is strong enough to drive pretty well all the body muscles.-So if you grab the mains by your hands both the clenching and un-clenching muscles will be driven and the clenching ones will win.That’s why it is said, "you cannot let go of DC, but you can (perhaps) let go of AC."This is the basis of the idea that DC is more dangerous than AC.ALSO:"Low-frequency (50–60 Hz) alternating currents can be more dangerous than similar levels of DC since the alternating fluctuations can cause the heart to lose coordination, inducing ventricular fibrillation, a deadly heart rhythm that must be corrected immediately.[14] However, any practical distribution system will use voltage levels quite sufficient for a dangerous amount of current to flow, whether it uses alternating or direct current. As precautions against electrocution are similar for both AC and DC, the technical and economic advantages of AC power transmission outweighed this theoretical risk, and it was eventually adopted as the standard worldwide."http://en.wikipedia.org/wiki/War...PS Don’t try to check this doubt by yourself.. Stay safe :P
How to convert km/h to m/s? What is the distance traveled by a car in 1 second at 72 km/h?
Everytime that you need to convert a value given in kmph (kilometer per hour) to m/s (meters per second), there is a very easy way to do this.To convert a value in kmph to m/s, multiply it by 5/18.To convert a value given in m/s to kmph, multiply it by 18/5.So, if the car is going at 72kmph, then its speed in m/s will be 72 x 5/18 = 20 m/s.Thus, the car travels 20 meters in one second.Similarly, if the car is travelling at 90kmph, then converting it to m/s : 90 x 5/18 = 25m/s.Hope my answer helps.Cheers!Ps: Thank you Shruti Kumari for A2A
What does this mean on the back of a gold necklace?
I have a gold necklace, and Im not sure of its value. Trying to figure out if its gold plated (most likely) or something better. Its a small gold cross and the markings on the back say "14k8F" and the next line says "PPC". The chain itself seems to have similar markings on the clasp. I found out that PPC stands for Princess Pride Creations out of Chicago, IL. and are the maker of this necklace. And of course 14K is the purity of the gold used. What is 8F?
What does this mark mean on my gold Bracelet?
It is the hallmark (signature/logo/ maker’s mark) of the jeweler who crafted your bracelet.Related, for your consideration:If your bracelet is 14K (Karat)Gold ,18K Gold and very rarely, 22K, look closely around the clasp and/or receiver to find the second hallmark.Gold content or the pureness of the gold alters the softness or hardness of the metal. Gold is measured in caratage or ‘kt’. You will need to determine how often you will be wearing your jewelry. Gold is a soft metal and can easily bend or be broken when in its most pure form.When buying gold jewelry you may Purchase 24kt, 18kt, 14kt or 10kt Gold in the USA. Other countries also allow 9 & 7 kt Gold to be sold. The Purest of gold is 24 kt. when you add other metal alloys such as copper, silver or palladium the hardness of the gold is increased. So the 24kt gold will be softest and then 10kt the strongest due to the other metal added to the gold. 24K is pure gold.Each gold variety (from 8K to 24K) has both a caratage and a decimal fineness. Pure gold equals 24 karats, or 24k, a caratage that can also be expressed in decimal form as .999 fine. Gold can never be 100% pure since there are always some impurities in it. The finest gold ever created was .999999 fine. The decimal is found by dividing the actual caratage by 24, the most carats gold can have.For example:14 karat gold is .583 fine because 14/24 = .583.It is 58.3% gold, and 583 parts out of 1000 are pure gold.Gold markings of 750 = 18K Gold, 585 and 583 = 14K Gold. This refers to the purity of gold and correspond with a caratage (Karat marking).Global Gold Markings and Their Significance333 - 8K Gold375- 9K Gold416 or 417- 10K Gold500- 12K Gold583 or 585-14K Gold750- 18K Gold916 or 917-22K Gold999-24K Gold
What is the solution for an equation of a line passing through the point of intersection of 2x-3y-5=0 and 7x-5y-2=0 and parallel to the lines 2x-3y+14=0?
Hope you understood… :)
How was your CBSE class 10 result?
Interpreter of MaladiesThe NamesakePaper TownsThese were the books which I finished during my board exam's preparation leave and when the exams were going on. I listened to Rekha Bharadwaj all the time. I used Quora regularly and watched my favourite shows on TV during the break.Seeing my such traits, my mother was confident that I'll score below 80%( although she didn't know about the books. Had she known it, she would have got a mini heart attack). Even I was thinking of scoring around 90%.Now came the D-Day. The result was to be announced by 4 in the evening. I was having my lunch when the result got declared at 2 pm.I was carefree until I picked up the phone to check the result. I began to tremble. Now the result was in front of my eyes.EnglishEXPECTED MARKS - 97ACTUAL MARKS- 99HINDIEXPECTED MARKS - 95ACTUAL MARKS- 95MATHEMATICSEXPECTED MARKS- 90ACTUAL MARKS - 90SCIENCEEXPECTED MARKS - 93ACTUAL MARKS - 97SOCIAL SCIENCEEXPECTED MARKS - 100ACTUAL MARKS -99FOUNDATION OF I.T.EXPECTED MARKS- 97ACTUAL MARKS - 100The most delightful thing was that I got first rank in the school.And finally, the happiest faces of my parents and the parents in school.PS: My decision of opting Humanities became talk of the town for the day and was appreciated a lot.:-)