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Waveforms

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stealthelectric

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Hi:
On the attached file you will see some waveforms. I need to differentiate between a.c. and d.c.
a) d.c. because it is a straight line all on one side of the zero line.
b) Is also a d.c. because of the same reasons as a), but this is a pulse
c) Is an a.c. because it crosses the zero line and is a regular repeating pattern
d) Is a.c. because of the same reasons as c)
e) Is d.c. because it doesn't cross the zero line, as with a)
f) Is a.c. because if crosses the zero line and is a regular repeating pattern.

Would somebody please check this for me.
Thank you
 

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Hi:
On the attached file you will see some waveforms. I need to differentiate between a.c. and d.c.
a) d.c. because it is a straight line all on one side of the zero line.
b) Is also a d.c. because of the same reasons as a), but this is a pulse
c) Is an a.c. because it crosses the zero line and is a regular repeating pattern
d) Is a.c. because of the same reasons as c)
e) Is d.c. because it doesn't cross the zero line, as with a)
f) Is a.c. because if crosses the zero line and is a regular repeating pattern.

Would somebody please check this for me.
Thank you

hi,
You have read the sequence of 'a thru to f' incorrectly.

The figure sequence as drawn is
Code:
a      d
b      e
c       f

you have read it as
Code:
a    b
c     d
e    f
So this makes your answers appear wrong, repost your answers...:)
 
Last edited:
It's a trick question because some of the waveforms have both AC and DC components.
 
It's a trick question because some of the waveforms have both AC and DC components.


The OP has to differentiate between 'ac' and 'dc' , not 'ac' and 'dc' components.

I need to differentiate between a.c. and d.c.
 
Last edited:
Then B and F are neither AC nor are they DC, they're both.
 
Hi eric:

You have read the sequence of 'a thru to f' incorrectly.


Actually, I didn't. These were my answers for the waveforms as:
a d
b e
c f

I guess I just don't understand.
So:
a=d.c.
b=d.c.
c=a.c.
d=a.c.
e=d.c.
f=a.c.
Are all incorrect?
 
Hi eric:

You have read the sequence of 'a thru to f' incorrectly.


Actually, I didn't. These were my answers for the waveforms as:
a d
b e
c f

I guess I just don't understand.
So:
a=d.c.
b=d.c.
c=a.c.
d=a.c.
e=d.c.
f=a.c.
Are all incorrect?

hi,
Alternating Current 'ac' is a current that changes direction thru the conductor.

So if the waveform passes thru zero, ie: swings both above zero volts and below zero volts it 'ac', otherwise its direct current 'dc'.

The answers look good to me.
 
Last edited:
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