Calculating Frequency for AC Waveforms

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To calculate the frequency of AC waveforms, first convert the time from milliseconds to seconds. The frequency can be determined using the formula f = number of cycles / time in seconds. For the given examples, the first waveform completing 4 cycles in 5 ms results in a frequency of 800 Hz, while the second waveform completing 5 cycles in 8 ms results in a frequency of 625 Hz. It's important to remember that frequency is typically expressed in Hertz (Hz). Proper unit conversion is crucial for accurate calculations.
daveiejbeer
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Hello my mind has gone blanc whilst in the middle of my AC Theory assignment.
The question is:
Calculate the frequencies for the following wave forms:
i. An alternating current that completes 4 cycles in 5ms
ii. An alternating current that completes 5 cycles in 8ms.

Am I right in thinking work out how many ms to complete 1 cycle then work out using f = 1/T

Can anyone point me in the right direction?

Dave
 
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Welcome to PF!

Hello Dave! Welcome to PF! :wink:
daveiejbeer said:
Am I right in thinking work out how many ms to complete 1 cycle then work out using f = 1/T

Yup! :biggrin:

Well … sort-of … if it's 1 cycle in T milliseconds, then it's 1000 cycles in T seconds, so it's … ? :smile:
 
frequency is usually in Hz so you need first to convert the time from ms to s .. the second thing is that what you are thinking is right,but there is an even easier direct way .. Why just don't you say that the frequency (f) = no. Of cycles / time .. :) then you will have the problem done..
 
Hi daveiejbeer, welcome to PF.
Frequency f = no. of cycles per second.
In the first case convert ms to s and find f.
 
Thanx for your help. I have already worked out the answers but I wasn't converting it into seconds, Doh!

Thanx once again.

Dave
 

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