Which graphs represent different types of current flow?

[jaximus]

Homework Statement

(1) Name the waveform(s) that represent a periodical current flow.

(2) Name the waveform(s) that represent a direct current.

(3) Name the waveform(s) that represent a non-periodical alternating current.

(4) Name the waveform(s) that represent a current with a non-positive average

Each letter can be used more than once or not at all. I find some graphs to be very tricky and confusing. For example, graph A looks like a direct current graph but it goes below the 0 line a little, causing me to doubt it. Graph E and G are very weird graphs for me as well.

Homework Equations

No calculations required. Question only requires me to choose which graph fits which description.

The Attempt at a Solution

My answers: 1) C, A, D
2) D, F
3) B, E, G
4) E

 

[SammyS]

Homework Statement

(1) Name the waveform(s) that represent a periodical current flow.

(2) Name the waveform(s) that represent a direct current.

(3) Name the waveform(s) that represent a non-periodical alternating current.

(4) Name the waveform(s) that represent a current with a non-positive average

Each letter can be used more than once or not at all. I find some graphs to be very tricky and confusing. For example, graph A looks like a direct current graph but it goes below the 0 line a little, causing me to doubt it. Graph E and G are very weird graphs for me as well.

Homework Equations

No calculations required. Question only requires me to choose which graph fits which description.

The Attempt at a Solution

My answers: 1) C, A, D
2) D, F
3) B, E, G
4) E

Hello, @jaximus . Welcome to PF.

You did well to use the "UPLOAD" feature for your image.
I find it helpful for the full image to be shown in the post rather than just showing the thumbnail image, but other helpers may disagree with me.

As for your answers, I agree with all but 4), which should have one additional selection.

 

[jaximus]

Hello, @jaximus . Welcome to PF.

You did well to use the "UPLOAD" feature for your image.
I find it helpful for the full image to be shown in the post rather than just showing the thumbnail image, but other helpers may disagree with me.

As for your answers, I agree with all but 4), which should have one additional selection.

Alright, I'll keep that in mind. Thank you for the advice SammyS.

 

[SammyS]

Alright, I'll keep that in mind. Thank you for the advice SammyS.

OK.

As for answer 4.

If an average is zero, then it is non-negative, right?

 

[jaximus]

OK.

As for answer 4.

If an average is zero, then it is non-negative, right?

Ah yes, it should be. Then number 4 will include graph C since it has an average of 0. Thank you for the lead.