What is RMS and Average Voltage?



What is RMS and Average Voltage?

RMS Value

RMS is the square root of the squared function of the values. Since the AC voltage is never static, it keeps on rising and falling and thus so with time, hence the AC voltage is needed more to produce a RMS voltage and which is different for DC current. DC is Direct Current and AC is Alternating Current.

AC or alternating current is the current which is electric and reverses on the direction and changes the magnitude for continuous period of time whereas in Direct current it does flow in one direction. AC is the type of current that is sent over to residences and offices.

This AC current is the one that has electric energy and this is the one when we put the plugs of our machines and appliances to power point to a electric socket. On the other hand a common source for Direct Current is that the cell battery light for a flashlight. These are all terms used for current because they either modify current or voltage. The usual way the AC current moves across the power circuits is by a sine Wave. A sine wave the half periods which are positive are the ones which means the positive directions of the current. In some cases like Guitar some direct waveforms are created which are different and these can also look like square waves. Some signals like Radio signals carry on some electric waves form which are Alternating. These AC current forms will carry some audio or video signals in form of waves and this happens by changing the AC signal. These currents always change AC currents at some frequencies which are very high.

High voltages have many disadvantages-

  1. Increased insulation and is difficult for safety. In some power plants where energy is generated at some good voltage for the generator design and then it is stepped up to some high voltage for the transmission system. Some consumer voltages will be different from the way it is handled and size of the load system and it is thus used for making few hundred volts between its alternating phases.
  2. Sometimes the voltage which is given to any equipment is made standard amount and this happens within a certain range of allowable range of voltage and thus this is where the equipment is operating accordingly.
  3. When there is utilization in a standard way for any voltage and there is a percentage which keeps on changing accordingly it may mean that it is different in the main power system. Thus High voltage Direct Current the electric power transmission is more viable because the technology provides the means of changing the DC power voltage. Thus the transmission of any High voltage direct current is not possible for the electric power transmission. This was not possible in the early days as the economic viable ways is not possible for transfer of these current.

We can also refer here to Three phased electrical which is generated and is also a very common practice. This is the way where the simple thing is to take three simple separate coli in the generator state and at angle of 120 degree and these are angled at one another. Three different form of current waveforms will thus be produced and these will be equal in magnitude and will phase each other. If the coli are however put in different angles to one another then they will generate the same phases and it will have different polarity to one another and thus can be wired together. For example if we take a machine with 12 poles and have 36 coils then the advantage for this it the lower rotational speed can be used to generate the same speed and frequency. On these three phase system if it balanced out among the phases which is the load then there is no current flow through them. Even the neutral current will not be more than the phase currents.

Thus a Direct current will flow through the uniform space or wire. While the Alternating current of any said frequency is always taken away from the centre of the wire. Towards the outer surface. There is accelerating power and electric charge for the Alternating current and it thus produces the electromagnetic radiation.

Learn more onAlternating Current from Class 12 Physics

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