how ac current is formed?
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An alternating current is produced by an electric generator. ... As the wire rotates in the magnetic field, the changing strength of the magnetic field through the wire produces a force which drives the electric charges around the wire. The force initially generates an electric current in one direction along the wire.
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Current is the flow of charges. ... Hence, electric current is the flow of electrons in a circuit. It is directed from the negative terminal to the positive terminal. Conventional current on the other hand is the flow of positive charges and is directed from positive terminal of the battery to the negative terminal.
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The opposition offered to the flow of current in an AC circuit because of resistance, capacitance and inductance is known as Impedance. Resistance occurs in both AC and DC circuit, whereas Impedance takes place only in an AC circuit. ... Resistance is denoted by (R) whereas impedance by (Z).
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The discharge current, in amps (A), is expressed as a fraction of the numerical value of C. Typical tubular positive lead-acid cell behavior at various discharge currents. For example, 0.2 C means C/5 A, and discharging will take approximately 5 hours. If C = 40 Ah, a current of 4 A can be expressed as 0.1 C.
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DC can be generated in a number of ways: An AC generator equipped with a device called a "commutator" can produce direct current. Use of a device called a "rectifier" that converts AC to DC. Batteries provide DC, which is generated from a chemical reaction inside of the battery.
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DC (Alternating Current vs. The difference between AC and DC lies in the direction in which the electrons flow. ... In DC, the electrons flow steadily in a single direction, or "forward." In AC, electrons keep switching directions, sometimes going "forward" and then going "backward."
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Electrons flow from the negative terminal to the positive. Conventional current or simply current, behaves as if positive charge carriers cause current flow. Conventional current flows from the positive terminal to the negative.
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Lightning cannot be AC, since the wave shape of Lightning current is not sine-wave shaped voltage. A typical lightning current waveform looks something like this as shown below. This complete event (A, B and C) is a single strike. Therefore, Lightning is neither DC nor AC.
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In an AC generator, the coil through which current flows is fixed and the magnet usually moves. The south and north poles of the magnet make the current flow in opposite directions, thereby creating an alternating current. In contrast, the coil in a DC generator is not fixed; rather it rotates in a fixed field.
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Alternating current (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction. ... These currents typically alternate at higher frequencies than those used in power transmission.
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A galvanic current uses mild electric currents that consist of positive and negative ions to stimulate the local muscles. The outcome of a galvanic current is maintaining the muscle physiology. The faradic current has a frequency of 50 Hz. It produces tetanic muscle contraction.
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An AC motor is an electric motor driven by an alternating current (AC). The AC motor commonly consists of two basic parts, an outside stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft producing a second rotating magnetic field.
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Alternating current (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction. Most students of electrical engineering and related subjects begin their studies by learning about direct current (DC).
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What is the main difference between direct and alternating current? Direct current is electricity that flows in only one direction; alternating current is electricity that reverses at regular intervals.
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Answer: To produce an electric current, three things are needed: A supply of electric charges (electrons) which are free to flow, some form of push to move the charges through the circuit and a pathway to carry the charges. The pathway to carry the charges is usually a copper wire.
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Almost always, the moving charges are electrons (NOT protons or other charged particles). The unit we use to measure current is the ampere, usually pronounced in shortened form as "amp". So, saying that 1 amp is flowing through a wire is equivalent to saying 6.24x1018 electrons are flowing down the wire every second.
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Direct current Batteries and electronic devices like TVs, computers and DVD players use DC electricity - once an AC current enters a device, it's converted to DC.