Fig 3 – Mid-Ordinate or Graphical Method for RMSįirst, We will find the instantaneous values of voltages for each each time period like t = 1, t =2 … t = n etc. tn, the instantaneous voltages levels are V 1, V 2, V 3 …. It shows at instance of t = 1, t = 2, t = 3 …. As shown in the fig 3 below where the number of mid ordinates are 12, (The more the mid ordinates, the more accurate will be the result). There are many instantaneous voltages in an AC sine wave and its depends on the time interval. For clear understanding, a solved example is given below the explanation. This method is known as mid ordinate or graphical method to find the value of RMS voltages by using mid-ordinates or finding the instantaneous value of AC waveform. Keep in mind that the ampere meters and volt meters connected in AC circuits always showing the RMS values (of current and voltage). This voltage level shows the effective value of ( 110V or 220V R.M.S) and it shows that the home wall socket is capable to provide the same amount of average positive power as 110V or 220V DC Voltage. In more clear words, The domestic voltage level in US is 110V, while 220V AC in UK. It means the RMS value of a sine wave is equal to the DC Voltage source producing the same amount of heat generated by AC Voltage source. By adjusting the value of DC voltage to get the same amount of heat generated before in AC voltage source in fig a. When the same resistor is connected across the DC voltage source as shown in (fig 2 – b). For example, When a resistor is connected to across an AC voltage source, it produce specific amount of heat (Fig 2 – a). The RMS Value of an Alternating Current is that when it compare to the Direct Current, then both AC and DC current produce the same amount of heat when flowing through the same circuit for a specif time period.Īctually, the RMS value of a sine wave is the measurement of heating effect of sine wave. The value of an AC which will produce the same amount of heat while passing through in a heating element (such as resistor) as DC produces through the element is called R.M.S Value. In each cycle, it changes the value from zero to the maximum and again hit the zero value. In other words, alternating current (AC) is a type of current which flows first in one direction and secondly, it flows in the opposite direction. On the other hand, (AC) Alternating Current or Voltage is one which regularly changes its direction as well as its value. it is a unidirectional value which does not change the polarity as well as direction as shown in fig 1. It is known that the polarity of DC voltage and direction of DC current are always same i.e. What is Peak Voltage or Maximum Voltage Value ?.Average Value & RMS Value Formulas for Different Wave forms.Methods for Finding Average Value of Sine Wave.RMS Voltage Value Formulas for Different Wave forms.Methods for Finding RMS Value of Sine Wave.
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