Calculating Frequency for AC Waveforms

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Homework Help Overview

The discussion revolves around calculating the frequencies of alternating current (AC) waveforms based on given cycles and time intervals. The subject area is AC theory, specifically focusing on frequency calculations.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to determine frequency by calculating the time for one cycle and using the formula f = 1/T. Some participants confirm this approach while also suggesting a more direct method of calculating frequency as the number of cycles divided by time.

Discussion Status

Participants have provided guidance on converting time from milliseconds to seconds and have discussed different methods for calculating frequency. The original poster acknowledges the oversight in unit conversion and expresses gratitude for the assistance received.

Contextual Notes

There is a mention of homework constraints regarding unit conversions and the need for clarity in frequency calculations. The original poster's initial misunderstanding about unit conversion is noted but not resolved.

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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