You are clearly right on the second point, at the time of the invention changing a DC voltage was pretty much impossible, which a transformer was very easy to build. AC and DC are also used when referring to voltages and electrical signals which are not currents! So why do we use AC? AC generators gradually replaced Edison's DC battery system because AC is safer to transfer over the longer city distances and can provide more Another difference between AC and DC involves the amount of energy it can carry. its very important and well explained regarding Ac and DC current.thankyoujust what we needed for a good start.......tanks bro....Edit or create new comparisons in your area of expertise.Storage and Conversion From AC to DC and Vice Versa It’s easier to change the voltage of an AC current , and the higher the voltage, the less power is lost. Electricity flows in two ways: either in an alternating current (AC) or in a direct current (DC). Haven’t you ever seen birds perched on a power line?No, I have never seen a bird perched on a high-voltage power line (though I of course see them all the time on the lower-voltage, residential power lines).However, I think you’re right and that was a false claim. Therefore, AC from the power mains is rectified using diodes or other rectifiers, and converted into DC electricity. The relation between the direct current and the voltage is given by. Please see If using the same landline, AC also has the disadvantage of leading to skin-effect, so the same "wire" has a higher ohmic resistance for AC (but ok, we have ways to deal with this). This is why non-residential power lines are more dangerous than residential power lines: they have a much higher voltage to reduce power loss over long distances. Designed for AQA P2. AC Power vs DC Power
The majority of today’s electronics either do or can run on DC current, and must be converted from AC, which comes out of wall-outlets, in order to run. The difference between AC and DC lies in the direction in which the electrons flow. Since the days of Tesla and Edison, engineers have developed ways to increase the voltage of DC … Mains electricity (as it is known in the UK and some parts of Canada; US terms include utility power, grid power, domestic power and wall power; [citation needed] in much of Canada it is known as hydro) is the general-purpose alternating-current (AC) electric power supply. ... Mains electricity in the UK has a frequency of 50Hz. Powerpoint and complementary workbook to cover Mains Electricity, AC/DC, Oscilloscopes, Plugs, Fuses and Electric safety. The reactive power that is needed because of the landline capacitance also has to be produced and is basically "wasted".
Tesla was a genius who harvested energy from the Niagra Falls using AC.
The history of AC begins from Tesla. In DC, the flow of electrons goes in one direction only. Each battery is designed to produce only one voltage, and that voltage of DC cannot travel very far until it begins to lose energy. Electricity or "current" is nothing but the movement of electrons through a conductor, like a wire. DC can be "bumped" up or down, it is just a little more difficult. Those are the reasons why we get more and more HV-DC landlines. Transforming to a higher voltage leads to lower currents and voltage drops on the landline, therefore less power loss.Magnetic fields do not physically repel birds, nor attract them for that matter.
For example: a 12V AC power supply has an alternating voltage (which will make an alternating current flow). Alternating current is the best way to transmit electricity over large distances. But a landline is not purely ohmic, it is also a capacitive load (also a minor inductive part, but we can neglect that for 50Hz lines). But AC's voltage from a generator, in a power plant, can be bumped up or down in strength by another mechanism called a AC can even be changed to DC by an adapter that you might use to power the battery on your laptop. AC electricity loses less power over power lines than DC. In addition, DC is safer – according to IEC 60479, it takes about four times as much DC current to kill a man than AC current. There are three main reasons: I'm not so sure about your first reason: on a pure ohmic load a DC voltage will lead to the same losses as the corresponding AC RMS voltage (per definition). Alternating current and direct current [1] provide two different methods for the transportion of electricity. Most of the common electronic devices from computers, stereos, and TVs use DC electricity for their operation. "AC vs DC (Alternating Current vs Direct Current)." AC electricity tends to travel on the surface of the wire and loses power over distance due to the Skin Effect and capacitive coupling, whereas DC electricity travels through the whole wire.
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