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Frequency, as regards voltage, is a term applied to changes in the voltage per unit of time. As the voltage of the DC (direct current) supply does not change, it does not "cycle" like an alternating current (AC) supply. The frequency of oscillation of the voltage is zero cycles per second, or zero Hertz.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoThe general equation for current is i(t) = Acos(ωt + ϴ)
i(t) is the current as a function of time. A is the amplitude, ω is the radial frequency (ω = 2πf), f is the frequency and ϴ is the phase shift.
If ω = 0 (f = 0), then the current does not change with time. In other words, it is a Direct Current (DC).
If ω ≠ 0, then the current changes with time, or is an Alternating Current (AC).
Wiki User
∙ 11y agoas the frequency gets lower and lower it approaches zero
60 cycles per second is power in usa
1 cycle per second moves the hands on your watch
the frequency on a solar cell is 1 cycle per day
the frequency on the north pole on earth is one cycle every 25000 years
the last will be observed as zero by most of us short lived races
Wiki User
∙ 11y agoThis is because DC current does not change directions. It travels in only one direction.
Wiki User
∙ 12y agodc is the particularization of ac for freq =0 Hz so in a frequency representation you have the dc response in the y-axis, at f=0´Hz.
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What is the lowest frequency of an LC low-pass filter?
The lowest frequency of an LC low-pass filter is zero, i.e. DC.
Well you can say that the frequency of DC is constant or not?
Yes it is constant at Zero Frequency. No, DC or Direct Current only means that the current only goes one direction, but it can have a frequency. You can have a square wave, sawtooth wave or sine wave that never goes from positive to negative or negative to positive and it would be a direct current with a frequency.
How do you calculate complex frequency?
As far as know, frequency is not complex and is a positive number denoted in cycles per seconed like 60 cps. 0 cps is sometimes noted as DC, direct current with frequency of zero.
If it true that ac current can pass through the capacitor while dc current can not?
In case of DC: because the frequency of dc current is zero capacitive reactance ( Xc) = 1/2(22/7)fc f= frequency c=capacitence and when Xc=0 this implies that I=0 In case of AC: Xc >0 => I>0
What is the frequency of DC signal?
Zero = Nothing = Nil = 0 Hertz or Cycles per Second Direct Current is just as its name says: it does not alternate so it does not have any "frequency".
What is frequency of dc?
You can say DC voltage has a frequency of zero Hz.Because it is unidirectional in nature (may be positive or negative)
Why use DC circuit when frequecy is zero?
DC has no frequency.
What is the frequency of 27 DC volts?
Basically, "frequency" applies to AC, not to DC. If you want to assign it a frequency, the frequency is zero. The amount of volts is not relevant.
Why frequency of DC current is zero?
frequency if it will not zero then we cant tell its dc ...AnswerFrequency is the number of alternations per unit time. As d.c. doesn't alternate, then zero divided by any quantity of time is zero!
Is DC signal is periodic?
Yes DC is periodic with zero frequency........and undefined fundamental time period To........
Can sonometer be used to find frequency of DC?
Here's a tip: You don't even need a sonometer. The frequncy of DC is zero.
Will an inductor work on DC?
An inductor cannot work in dc because the frequency is zero there by making the inductive reactance zero as a consequenceAnswerOf course an inductor can work in a d.c. circuit!
What is the lowest frequency of an LC low-pass filter?
The lowest frequency of an LC low-pass filter is zero, i.e. DC.
Why freqvency in AC and Why not in DC Voltage?
Frequency with AC is how many times in one second it goes thru a cycle of reversing polarity twice. DC does not reverse, in other words the frequency is zero.
Well you can say that the frequency of DC is constant or not?
Yes it is constant at Zero Frequency. No, DC or Direct Current only means that the current only goes one direction, but it can have a frequency. You can have a square wave, sawtooth wave or sine wave that never goes from positive to negative or negative to positive and it would be a direct current with a frequency.
How do you calculate complex frequency?
As far as know, frequency is not complex and is a positive number denoted in cycles per seconed like 60 cps. 0 cps is sometimes noted as DC, direct current with frequency of zero.
How can a class frequency be equal to zero?
How can a class frequency be equal to zero?
