Can someone explain to me why some consider it a good thing to go through engineering classes without using calculators?

beer

Lifer
Jun 27, 2000
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Inspired by the TI89 thread.

Let me say that, for math classes, I can understand not using a calculator. In a math class, the sole purpose of the class is to solve the question asked. In calc, diff eq, etc, there is nothing to really to set up, per se. You either know the integrating/differentiating/diff eq methods for that particular equation, or you don't.

But engineering is different. You are not going to school to learn to solve equations but rather to solve problems. There is a difference. The skill of an engineer comes from the ability to look at a problem and set up the equations to solve it, not to actually solve them - the solving is just arithmatic, although very complex. Anyone with a 11th grade education can solve most steady-state circuit problems, so what's the big deal about gloating about doing it by hand?

The whole issue reminds me of my logic design class. My professor has written the book we use for several years, and it has been proclaimed a spectacular book in it's current version. but his earlier versions he was ragged on because he didn't have any VHDL. All the companies and other professors were not approving of his book because it focused on solving of the individual equations, rather than the solving of actual problems. You'd never design anything at the gate level, so why spend an entire book on it? I can buy a CPLD with something like 4500 gates for $10 or something equally insane. Most other EE stuff seems the same way. I mean, you'd never be asked to solve any real system by hand, so what's the point? I'd understand the whole 'by hand' thing if you were just setting the problems up in terms of the variables given, but that is more or less restricted to physics, because i've never seen an EE test like that....
 

dighn

Lifer
Aug 12, 2001
22,820
4
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i think if you know how to do problems by hand, doing them with computer-aid should only be easier.
 

beer

Lifer
Jun 27, 2000
11,169
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Originally posted by: dighn
i think if you know how to do problems by hand, doing them with computer-aid should only be easier.

How do you figure?

All I need to do is set them up for a computer, the same way I set them up for a calculator. A student that gets bogged down in phasor arithmatic knows nothing more about EE than one that derives the exact same equations by hand and solves for the variables in the calculator. Like I said, it's just 10th grade math, over, and over, and over, and it's not particularily difficult, but it's time consuming.
 

CanOWorms

Lifer
Jul 3, 2001
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When I was an undergrad I had professors that let us use anything as long as you didn't communicate with anyone else. I had other professors that wouldn't let you use anything. It's just their own personal method of teaching I guess.

Why are you saying that you'd never see anything designed at the gate level? I have. I've also designed below the gate level. Granted, I'm no expert and what you learn in courses can be completely different than in industry since the courses just scratch the surface, but I'm not too sure about that.
 

dighn

Lifer
Aug 12, 2001
22,820
4
81
Originally posted by: Elemental007
Originally posted by: dighn
i think if you know how to do problems by hand, doing them with computer-aid should only be easier.

How do you figure?

All I need to do is set them up for a computer, the same way I set them up for a calculator. A student that gets bogged down in phasor arithmatic knows nothing more about EE than one that derives the exact same equations by hand and solves for the variables in the calculator. Like I said, it's just 10th grade math, over, and over, and over, and it's not particularily difficult, but it's time consuming.

i meant easier as in "less work", not as in "not as advanced"

i agree with you about phasor analysis. there isn't really much to gain by doing it by hand except maybe more practise. but doing things by hand/on a lower level in other situations may give you more intuition and perhaps insight.
 

beer

Lifer
Jun 27, 2000
11,169
1
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Originally posted by: dighn
Originally posted by: Elemental007
Originally posted by: dighn
i think if you know how to do problems by hand, doing them with computer-aid should only be easier.

How do you figure?

All I need to do is set them up for a computer, the same way I set them up for a calculator. A student that gets bogged down in phasor arithmatic knows nothing more about EE than one that derives the exact same equations by hand and solves for the variables in the calculator. Like I said, it's just 10th grade math, over, and over, and over, and it's not particularily difficult, but it's time consuming.

i meant easier as in "less work", not as in "not as advanced"

i agree with you about phasor analysis. there isn't really much to gain by doing it by hand except maybe more practise. but doing things by hand/on a lower level in other situations may give you more intuition and perhaps insight.

How much DC or real analysis do you know that does not involve complex numbers? I do hardly any. Not since 1st semester....
 

dighn

Lifer
Aug 12, 2001
22,820
4
81
Originally posted by: Elemental007


How much DC or real analysis do you know that does not involve complex numbers? I do hardly any. Not since 1st semester....

that's why i said maybe :D

 

Brutuskend

Lifer
Apr 2, 2001
26,558
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Back when I was in school they didn't HAVE calculators, and we liked it like that!!

We also walked 50 miles in the snow year around, UP hill BOTH ways, and we were GLAD to have it!

(The snow AND the hills!!) ;)
 

CanOWorms

Lifer
Jul 3, 2001
12,404
2
0
Originally posted by: Brutuskend
Back when I was in school they didn't HAVE calculators, and we liked it like that!!

We also walked 50 miles in the snow year around, UP hill BOTH ways, and we were GLAD to have it!

(The snow AND the hills!!) ;)

I'd rather have that than psychotic gun-wielding kids that we have nowadays! :Q
 

UltraPenguin

Member
Nov 25, 2003
27
0
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I'm lazy and avoid solving by hand whenever possible. I think given the choice, the majority of engineers would rather have a program do the manual calculation for them. It also depends on the problem, if I see some dinky integration, I'm not going to instantly pull out the TI89 and start entering the stuff in. If I can do it faster by hand, I'm doing it by hand.

As you said, most of the problem lies in the setup. In my math intensive classes, the final calculation really isn't that important. You would get almost full credit if the problem is setup correctly and you show all your work up to that point.

However, you should understand the fundamental principle behind the calculation. Understand how the problem is solved instead of just punching the button and popping the answer out. Nothing sadder then to see someone needing Spice to solve a simple circuit, or the TI89 to do some trivial integral.
 

Mday

Lifer
Oct 14, 1999
18,647
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i just use my calc for + * - / and the occasional graphing... as if i am doing a fourier transform with a calc... or bothe rwith it, i have the table in front of me.