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 May 31st 2009, 12:55 PM #1 Junior Member   Join Date: May 2009 Posts: 1 Generator question Sine wave generation coil at 0 degree the coil is parallel with the north and south poles of the magnet, no voltage and no wave. At 90 degree coil is cutting maximum flux line and generates voltage and first positive, half of the wave. At 180 degree again no voltage end of one half of a wave. At 270 degree again cutting maximum flux lines and generating negative part of the wave. At 360 degree no voltage end of one complete wave, another one starts the process is same. If this is so, how can just one volt, bee generating 60 cycles wave, when sometimes its righten 120v equal to 60 cycles)? If period T is time it takes for one charge or a charge to complete one oscillation how does the coil turning and generating oscillating wave come in into the picture? I read 2 group of coils hade to be involved to generated to halfs of wave to make one complete, cose in dc there was only 1 group of coil and it had only one half of a wave. The wave would not have a negative peak only positive is that right?
 May 31st 2009, 09:47 PM #2 Physics Team   Join Date: Feb 2009 Posts: 1,425 If this is so, how can just one volt, bee generating 60 cycles wave, when sometimes its righten 120v equal to 60 cycles)? Where does 1 volt come from? What happens is that one rotation of the coil generates one cycle. The coil rotates 60 times a second, and the parameters i.e. magnetic field, number of turns etc. have been adjusted to give a root mean square value of 120 volts If period T is time it takes for one charge or a charge to complete one oscillation how does the coil turning and generating oscillating wave come in into the picture? What causes the oscillation in this case is the turning of the coil itself ! I read 2 group of coils hade to be involved to generated to halfs of wave to make one complete, cose in dc there was only 1 group of coil and it had only one half of a wave. The wave would not have a negative peak only positive That may be true. However normally proper a.c. with both -ve and +ve voltages is generated and then rectified to get d.c. This is because it is easier to convert a.c. to d.c. rather than vice-versa in case some application needs both a.c. and d.c.

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