How far can pulsed DC arc without insulation, say, 1800 volts 10 Hz.?
148484
A quote from the first source, "This phenomenon, which is called dielectric breakdown, occurs in air at an electric field strength of about Emax = 3 x 10^6 V/m."\n\nPaschen's law describes dielectric breakdown of a gas.  Given this and your problem, >0.6m separation will theoretically prevent arcing.\n\nOther sources note that arcing will occur over longer distances with dust, moisture, contaminants, etc. being present in the air.\n\nCheck out the sources and/or google "paschen's law air breakdown"
515359
1/1000th of an ampere
1026240
less than 0.3  for power sations\n0.5ohm for substation\n1 to 2 for homes
564411
This company is in Mumbai. The one they show is for 180-260V, but it says you can change the range. They don't give prices, however ...\n\nhttp://www.voltamp.com/Products/cvt-constant-voltage-transformers-ferroresoant.html
304949
depends on a couple o things...15ma will kill you if it high enough voltage (60 volts+) and it runs through you heart....
385689
You want arc length or straight line?\n\n934.59 nm\n\naccording to the reference below.
206554
1 amp (1000 millamps) is the maximum rated operating conditions for the transformer.  You may be able to get more current than that from the transformer, but the rest of its specifications (such as output voltage, operating temperature, efficiency, etc) are no longer guaranteed to be accurate.\n\nIt would be a good idea not to exceed this current draw if you want the transformer to last, and not pose a fire danger.  Consider using a fuse in your circuit to prevent overcurrent conditions.
1086026
You can get an idea on counting the discs on the insulator string and multiplying by 12kV/disc.\nAgain it is only a general rule of thumb and is not accurate.\n\nSource 50 years as an Electrical Engineer
974255
About plus and minus ten percent. That makes it 108 minimum and 132 maximum volts.\n\nMost appliances are designed to expect this range.
713269
Faraday's Law!\n\nMass Plated = t * I * MW / (n * F)\n\nt = time\nI = current (Amps)\nMW = mol weight of metal\nn = valence charge of metal\nF = Faraday's Constant (96,500 Coulombs/mol e-)\n\nSo....\n\nt = 2 days * 24 hours/day * 3600s/hour = 172800s\nI = 7.60 A\nMW = 51.94 g/mol\nn = 3 mol e- / mol M\n\nPlug it all in and you should get 235.62g of Cr.
119135
10mH is 10 milli-Henries.  A Henry is a measure of inductance, and is defined as L=di/dt.  Inductors resist changes in current flow.  You have to use calculus to get the equation for an RL (resistor-inductor) circuit, which is what you have.  You are subjecting an RL system to a step input of 10 V from a "voltage source."  See the more technical, long-winded explanation of inductance.\n\nThe second site actually shows you an animated plot of the exact ciruit you are interested in.  \n\nAs a note of interest, large iron core inductors were developed for power supply filters in Vacuum Tube radios and amplifiers.  They had huge inductances of 7H or more.  These days, everything is in microhenries or millihenries because the frequencies in today's electronic systems have gone past 1 gigahertz.  Inductors can act as frequency-dependent resistors.  \n\nThese days, one hugely popular use of an inductor is to store energy in a magnetic field for switching power supplies in conjunction with electrolytic capacitors and FET modulated drives.  Wound 60Hz transformers are quite expensive, large, and heat producing.  The days of linear power supplies with large iron core transformers have given way to tiny circuits with driving transistors, an inductor, and some capacitors.  Switching supplies running at 125kHz or more can use transformers with ferrite (powdered iron) cores and far fewer windings.  The higher frequency packs much more energy than a 60Hz electrical source.\n\nAs a point of interest, try to find an old computer power supply which should be very easy to get.  Open it up.  Look at the parts, and you will see a high frequency transformer, inductors, capacitors, and drive transistors with modulating chips.  The 120VAC from the wall is put through 4 diode rectifiers to make 169V DC with some high voltage capacitors.  This voltage is made available to be switched at relatively high freqencies into a powdered core transformer primary.  The Secondary makes high frequency AC voltage which is rectified and filtered with capacitors and/or inductors.  A voltage detector circuit, usually isolated from the high voltage DC side by an optical isolator, tells the modulating chip what the load is.  The modulator will then vary the duty cycle of the transistors at a constant frequency to move more power across the transformer.  Have fun with electronics!  I love it...
935132
keep it far from electrodomestics\n\n:> peace\n.
149476
This is my best guess based on a familiarity with the issue, but please don't take this as definitive.  I just wanted to give some answer as noone had as of yet.  \n\nAs I understand it, Edison used a voltage of 110 in his original DC systems after finding experimentally that it was the highest voltage that would illuminate his carbon filament bulbs enough to beat gaslight without burning them out too quickly.  Exactly what was considered "too quickly" I don't know.  \n\nThe first AC systems adopted the 110 V standard, although Nicolai Tesla, who developed such systems for George Westinghouse, wanted to use a higher voltage, 240 V.  \n\nLater, when some electrical systems switched to a higher voltage, they went with a multiple of 110 so as to make it easier to tap into one phase of the voltage to get the old 110 V potential back.  This is essentially what we have in the US.  We have 220 V service to our homes, and a few of the appliances that consume a lot of power, such as clothes dryers and AC systems, are wired to that, but the rest of the outlets are wired for 110.
741176
DC is battery and they do not generate a current. They store energy for use upon demand. They also do not store enough energy to maintain transmission for long periods.
824800
You can use an integrated circuit, like LTC6906 from Linear Technology which goes up to 1MHz at 2.25 - 5VDC supply,\nsee:  http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1010,C1096,P9790,D6998\nAlternative: MAX5094A by Maxim,  see:  http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5017\nI didn't have the time to check the output power, but if it's not enough, a simple emitter stage transistor will do.
871918
only in space where there is no air\n\nof  course there no clouds either but electrical spark can still be produced artificially\n\nedit: "a mile away for every second counted: -- make this about 4-5 seconds; the sound speed is about 300m/s
683205
About 1000 feet per sec.