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CBSE Class 12-science Answered

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Asked by | 05 Mar, 2008, 05:06: PM
Expert Answer

 what is the difference between instantaneous,average and  rms value of   current ??????

 Generaly in what of the above specified terms we measure current / voltage related to the numericals of the chapter????

Instantaneous value of ac current: It is its value at any point in time on a sine wave, the voltage (or current) has an instantaneous value. This instantaneous value is different at different points along the curve. Instantaneous values are positive during the positive alternation and negative during the negative alternation.

Most ac voltmeters display the rms value of a voltage. The 110 V at your wall outlet is an rms value. The RMS value of a sinusoidal voltage is actually a measure of the heating effect of the sine wave. The RMS value of a sinusoidal voltage is equal to the dc voltage that produces the same amount of heat in a resistance as does the sinusoidal voltage.The term RMS stands for root mean square. It refers to the mathematical process used to derive this value. The RMS value is also referred to as the effective value.

The average value of a sine wave when taken over one complete cycle is always zero because the positive values (above the zero crossing) offset the negative values (below the zero crossing).

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