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Zero Frequency Of dc

Question asked by Naman Agarwal in #Coffee Room on Aug 17, 2012
Naman Agarwal
Naman Agarwal · Aug 17, 2012
Rank C3 - EXPERT
how can we proove that the frequency of dc is zero??? Posted in: #Coffee Room
Abhishek Rawal
Abhishek Rawal · Aug 17, 2012
Rank A2 - PRO
In Direct current, current/voltage doesn't change with time, hence frequency (f) = zero.

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Ramani Aswath
Ramani Aswath · Aug 17, 2012
Rank A1 - PRO
Frequency = (number of changes/sec), in this case the number of times the voltage changes.
A pure DC is constant. So number of changes = 0.
0/secs = 0.
However if you have a DC with a wave form such as square wave, saw tooth or even a single phase full wave rectified unfiltered DC there will be a frequency, which will be the numbers of peaks/sec.
Jeffrey Arulraj
Jeffrey Arulraj · Oct 14, 2012
Rank A2 - PRO
to experimentally verify this use a circuit having a source and capacitor in series to it

Measure the voltage across the capacitor if it varies then the source is AC but if it is stable at the input voltage it is DC supply

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