What is the difference between touching a low voltage AC line(220/110 V) Vs a HVDC(High Voltage DC)line?
No there's nothing like that.You get thrown because of abnormal contraction of muscles.Electricity is not throwing you.Both are dangerous and damage is determined by amount of time you are in contact, strength of current and power loss that takes place in your body.Reason DC is used has to do with cutting transmission losses.If you have to fence very large area and you want to keep power losses to minimum you use DC. Therefore whether you get stuck or not has to do with the way your muscles react to this stimulus and not on AC or DC.
220 Volt AC vs. 120 Volt AC??
Generally, there are some energy savings with a higher voltage appliance. What you've got to do is balance the projected savings (for the same BTU capacity) with the cost of the appliance. For example, suppose you could cut the monthly cost down to $145 per month - a $15 per month savings. If you had to spend $800 on the air conditioner it probably would not be worth it since the "payback" time would be about nine years (using the unit for six months annually). Get the consumption figures and do the math and you'll have your answer.
Why does America use 110v as single phase voltage but Europe and Asia use 230v? What benefits does it draw?
The US isn’t the only country to use 110v single phase. Another country is Japan.There are several reasons:The reason why specifically 110v is because that is roughly the conductance resistance of dry skin. So you can touch a live 110v wire without getting a shock. If your hands are wet or say you’re covered in sweat then that will still shock you.Because the risk of shock is lower the need for an earthing wire is removed. This simplifies electronics and wiring, saving costs and reducing the space needed.Where human populations are high but power generation is relatively low this can be used in conjunction with other measures to minimise the electric load each person places upon the system (per capita).No need for clunky earthing rods or expensive safety procedures.Note:Just because there may be a large domestic usage of 110v single phase power that doesn’t mean there aren’t higher voltage systems used in the domestic setting. For example, in the UK many commercial kitchens will use 350v 3-phase voltage even though the majority of domestic usage is 240v single phase.Compare these plugs:On the left a Japanese style 110v plug. On the right a UK style 240v plug.These images are to the same scale. You can quickly see that the UK plug is a lot larger and more cumbersome. It is more complicated to make, has more parts and more points of failure. E.g. the fuse can blow or the wrong fuse can be fitted. The pin protection system in sockets can easily become broken due to plugs being forced.Here’s a North American plug and socket:And here’s the equivalent for the UK 240v system:Although this time these images are not exactly to scale you can still see that UK sockets take up more space.Once you multiply this space usage several times the difference becomes bigger:So, I’d say the primary reason is because of simplicity. 110v won’t shock you so easily and when it does it’s less likely to kill you. It saves a lot of money when multiplied over millions of people.
How many volts will kill you?
Its 110 volts of ordinary house current or 42 volts of DC current is enough to kill a person. And even that depends on type hands you touch with(dry or wet).More easy to be killed with wet hand ,that's because wet hands decreases the resistance by a great value and allows a greater current into your body when compared to dry hands. A current of 20 milliampere is enough to kill a person with dry hands. The resistance of two dry hands measures about 1 million ohm.BODILY EFFECT DIRECT CURRENT (DC) 60 Hz AC 10 kHz ACSlight sensation Men = 1.0 mA 0.4 mA 7 mA felt at hand(s)Women = 0.6 mA 0.3 mA 5 mAThreshold of Men = 5.2 mA 1.1 mA 12 mA perception Women = 3.5 mA 0.7 mA 8 mAPainful, but Men = 62 mA 9 mA 55 mA voluntary muscle Women = 41 mA 6 mA 37 mA control maintainedPainful, unable Men = 76 mA 16 mA 75 mA to let go of wires Women = 51 mA 10.5 mA 50 mASevere pain, Men = 90 mA 23 mA 94 mA difficulty Women = 60 mA 15 mA 63 mA breathingPossible heart Men = 500 mA 100 mA fibrillation Women = 500 mA 100 mA after 3 seconds
Question about halogen lamps & voltage (110V-220V)?
Hi, I'm currently using a European (220V) halogen floor lamp in the US (110V) connected to a transformer. I have other similar lamps but I no longer have any of the R7S (200W 230V) bulbs they take. Looking online I can only find 120V bulbs. My questions is, can I use these 120V R7S bulbs instead of the 230V R7S bulbs? Does the lamp have components that require a certain voltage, or is it just the bulb that requires the right amount?
Up to how many volts of electricirty, a human body can resist?
when people say "its not the volts, its the amps that kill you", they are not giving you 10% of the answer. that's because the amps that flow through your body depend on both the voltage of the source and you body's resistance. according to many studies, experts place the minimum fatal amp value of 20-70 milliamps of current across the heart. a fat person will have a higher electrical resistance, so if the same voltage were applied across the heart of a fatty and a regular person, the amps across the fatty's heart will be lower, ie, the fat guys stands a better chance. as i mentioned, amps is proportional to voltage and inversely proportional to resistance. so it makes a difference if your hands are wet or not. it also makes a difference if the electricity travels from your left hand to your left foot, as opposed to from the left hand to the right hand (which is more dangerous as your heart is within the route). if you rewired a pacemaker to a car battery of 24V, that can be fatal too, because resistance in side the body and across a small distance is very low. in the usa, mains line provides 110V. this is generally non fatal for a wide range of human body resistances, unless someone is exposed to prolonged durations of electricity. at 240V there is much greater danger but if your hands are dry you will only get a painful shock. otherwise you might get temporarily paralysed for a week (happened to an electrician friend of mine). it is rare to die from 240V. higher voltages are present in electric train tracks (600-1000V). that will surely kill.
What light bulb to use for 250W/250V socket?
250W/250V is the maximum rating on the socket. The more important question is first what is the standard voltage in your country? Next is what base is the socket? A "standard" base is also known as "Medium" base. If the socket is larger than "standard", then it is most likely a Mogul base. So you can put any light bulb into your socket that will fit its base up to the listed rating. The rating on a socket is based on the heat that it can withstand which is generated by the wattage of the bulb. You can put a 100 watt 120 volt bulb in there if your local power is 120 volts. 100 watts might be too bright, but you can put something smaller if you wish. Mogul base bulbs use to be available at well supplied hardware stores, but you would have to get them online these days if your lamp has a Mogul base. Most Mogul bases used today are high pressure vapor bulbs (aka "lamps"), but Mogul based incandescent bulbs can still be found. Without more description from you this is about as far as I can go to help you. Is it a 3-way? You can tell by looking into the socket. If it only has one contact in the center of the socket, then it is a single. but if it has two connectors within the center, then it is a 3-way bulb.
How dangerous is an electric shock from a normal household light switch?
Nothing long term will happen to you. As long as you pulled away from it really quickly. You received 110-120 Volts of Alternating current at 60 Hz. This means that the voltage cycles 60 times in one second between +120V to 0V to -120V. Because of alternating current voltage you were able to pull your hand away from it when it was cycling at 0volts. If it was DC (direct current) you wouldn't be able to let go. (DC is usually found in cars and high voltage applications) Be careful and have a professional look at your switch. being electricuted feels like your musles are being shaken out of control and your point of contact feels like a small burn. Unpleasant. Also consider that the Amperage will kill you if you are not careful. one amp is enough to kill you.