Jump to content

Robust debate - Technical discussions.


DHutch

Featured Posts

My grandad was very impractical although he was a successful businessman, much missed by his community.  He couldn't master driving a car and told us we were stupid when we told him that astronomical distances are measured in light-years.   He probably thought we were taking the piss.

Link to comment
Share on other sites

47 minutes ago, Murflynn said:

My grandad was very impractical although he was a successful businessman, much missed by his community.  He couldn't master driving a car and told us we were stupid when we told him that astronomical distances are measured in light-years.   He probably thought we were taking the piss.

A rocket explorer name Dwight

Could travel much faster than light

He took off one day

In a relative way

And landed the previous night.

  • Greenie 1
Link to comment
Share on other sites

4 minutes ago, Neil2 said:

A rocket explorer name Dwight

Could travel much faster than light

He took off one day

In a relative way

And landed the previous night.

Was his first name Reginald?. He was the original rocket man.

Edited by rusty69
  • Greenie 1
Link to comment
Share on other sites

On 18/01/2016 at 19:37, Murflynn said:

a common problem is when electrical questions are asked, using confusing or imaginary units.

 

if these ambiguities are not resolved quickly they just proliferate, adding to the confusion and frustration amongst those who have a technical background.

 

I guess what I am trying to say is that there are (at least) 2 sides to every issue.

There is also the situation where the OP (and others) simply don't like the answer to the question, or don't want to hear the truth.

 

 

(The truth? You can't handle the truth! -- Col. Nathan Jessep)

But is the answer to a question in imaginary units expressed as 'i' or 'j'?

Link to comment
Share on other sites

approximately

 

 

 

................  I'm just reading Fred Dibnah's Victorian Heroes.  Poorly written but fascinating stuff.  Like Whitworth (of screw thread fame) who patented many accurate machine tools, and improved accuracy in machining from 1/16" to 1/1000th" within 30 years in the first half of the 19th century. 

Edited by Murflynn
Link to comment
Share on other sites

13 hours ago, Murflynn said:

what is the square root of minus 1 ??

Depends whether you are an electrical or mechanical engineer, or a mathematician.

7 hours ago, Mike the Boilerman said:

There isn't one.

Or another opinion is it an imaginary number.

The concept of root (-1) is meaningful, and can be represented as either i or j provided that you are consistent. But you knew that anyway. 

Link to comment
Share on other sites

5 hours ago, Machpoint005 said:

Depends whether you are an electrical or mechanical engineer, or a mathematician.

The concept of root (-1) is meaningful, and can be represented as either i or j provided that you are consistent. But you knew that anyway. 

 

i represents current (as in v=ir)

So it just be j

Link to comment
Share on other sites

6 hours ago, Murflynn said:

i

or the number that the sky fairy forgot to create.

 

14 minutes ago, Mike the Boilerman said:

 

i represents current (as in v=ir)

So it just be j

 

10 minutes ago, rusty69 said:

When I went to skool,  i was for mathematicians and j for engineers. 

 

4 minutes ago, Mike the Boilerman said:

 

Yes, probably for the reason I just gave!

Yes to all the above. It's complex. :P

Made all the more confusing when engineering lecturers used j and the maths department lecturers who tried to teach us partial differential equations used i. One of them, I distinctly remember, also used made-up Greek letters.

Link to comment
Share on other sites

1 hour ago, rusty69 said:

Does that mean you don't understand it, or that you wish you didn't?:D

Fascinating!

Note that the author makes the exception (j) for electrical engineers only. It's the repeated exposure to electrical fluid that does it.

Edited by Machpoint005
sp
Link to comment
Share on other sites

Just now, Machpoint005 said:

Fascinating!

Note that the author makes the exception (j) for electrical engineers only. It's the repeated exposure to electrical fluid that does it.

Blimey, I wasn't expecting someone to read it! 

 

Link to comment
Share on other sites

2 minutes ago, Machpoint005 said:

Does that mean you don't understand it, or that you wish you didn't?:D

Fascinating!

Note that the author makes the exception (j) for electrical engineers only. It's the repeated exposure to electrical fluid that does it.

No, it means I didn't read it.

 

Its been a long time since I went to college so don't want to put my brain into shock. 

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.