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Changes between Version 33 and Version 34 of ElectricalIntroduction

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 === Current ===
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 When electrons are allowed to flow between the positive and negative battery terminals, we have a *circuit* and the battery's chemical reaction proceeds (until the chemical reaction is complete).  The number of electrons flowing between the terminals is called "Current" and is measured in [https://en.wikipedia.org/wiki/Ampere Amperes] aka Amps (named after [https://en.wikipedia.org/wiki/Andr%C3%A9-Marie_Amp%C3%A8re André-Marie Ampère].  The number of electrons flowing depends on how many electrons the battery can supply (how fast the chemical reaction can proceed) and the nature of the path carrying the electrons from one terminal to the other.
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 The electron flow generated by a chemical battery or a solar cell is always from one terminal to the other; this is called ''Direct Current'' or ''DC''.  Electricity can be generated in other ways such as turning an electromagnetic generator (alternator in your car, steam turbines in a power plant, etc.); when generated in this way, electrons are alternately pushed then pulled by the same terminal of the generator which is called ''Alternating Current'' or ''AC''.  The electricity from a wall outlet is alternately pulled/pushed 60-times per second.