Electricians should know their maths full stop! Do you?

[D Skelton]

Ok, so following on from darkwood's original thread on basic maths I thought I'd start a thread for people to add a few things that are a little more complex than basic multiplication and division. Nothing too hard but should still be easy peasy for any spark!

I'll start with this:




Make G the subject

ps. you can use MS Word or Math Input Panel in the accessories menu to write formulae.

 

[D Skelton]

Wow, 7 hours and 50 views and still no takers!?

C'mon people, surely it can't only be me that finds maths enjoyable?





Or maybe it is :49:

 

[Silly Sausage]

Just seen it!
Got to go now.
Answer will follow later.

Archy
(O level Elementary Maths
O level Advanced Maths
A level Maths
Numerous Higher Level Maths courses)

 

[Geordie Spark]

Just seen it!
Got to go now.
Answer will follow later.

Archy
(O level Elementary Maths
O level Advanced Maths
A level Maths
Numerous Higher Level Maths courses)

You forgot "Habitual Bull Sitter".

 

[Elmer BeFuddled]

Gotta say, I love me math. But you've got me here!!

 

[i=p/u]

Don't know why any sprk will need to know this, but I enjoy maths and haven't a clue, it's one of them things they brush on but you never need it ,


easier ones skelli

 

[Silly Sausage]

G[SUP]2 [/SUP]= (e.f[SUP]0.5[/SUP])/(h((a.d[SUP]2[/SUP])/b.c)[SUP]2[/SUP])

G = ((e.f[SUP]0.5[/SUP])/(h((a.d[SUP]2[/SUP])/b.c)[SUP]2[/SUP]))[SUP]0.5[/SUP]

 

[Silly Sausage]

You forgot "Habitual Bull Sitter".

...:24:

 

[Silly Sausage]

OK Dave (D Skelton, it's got to be! )

Easy one...

RYB rotating anti clockwise, if R is the reference, what are Y & B in complex form?
Assume per unit form.

 

[telectrix]

can't do the symbols but my answer is 32 . G = 32ft/sec^

 

[D Skelton]

Don't know why any sprk will need to know this, but I enjoy maths and haven't a clue, it's one of them things they brush on but you never need it ,


easier ones skelli

Recognise any of these equations?



That's one reason why knowing this stuff might be useful

 

[Geordie Spark]

Recognise any of these equations?

View attachment 17217

That's one reason why knowing this stuff might be useful

Now yer just showin' off !!!

 

[D Skelton]

OK Dave (D Skelton, it's got to be! )

Easy one...

RYB rotating anti clockwise, if R is the reference, what are Y & B in complex form?
Assume per unit form.

Dave it is not

Erm, ya got me stumped! All I can see is 120 and 240? Either I'm missing something fundamental or I'm massively overthinking it!

Maybe if you were to expand on the context of the question I might see what you're getting at.

G= (e.f[SUP]0.5[/SUP])/(h((a.d[SUP]2[/SUP])/b.c)[SUP]2[/SUP])

G[SUP]0.5[/SUP] = ((e.f[SUP]0.5[/SUP])/(h((a.d[SUP]2[/SUP])/b.c)[SUP]2[/SUP]))[SUP]0.5[/SUP]

Very nearly!

One correct answer would be:

 

[Silly Sausage]

Dave it is not

Erm, ya got me stumped! All I can see is 120 and 240? Either I'm missing something fundamental or I'm massively overthinking it!

Maybe if you were to expand on the context of the question I might see what you're getting at.





Very nearly!

One correct answer would be:
View attachment 17218

Derek,

Balls! I'm going to have to look at my workings on that, too flash for my own good there!.

RYB, think vectors, think j (sqrt(-1)) and all will be revealed.

 

[D Skelton]

Derek,

Balls! I'm going to have to look at my workings on that, too flash for my own good there!.

RYB, think vectors, think j (sqrt(-1)) and all will be revealed.

Ahh yes!

Derek it is not

fR = cos(ωt) + (e[SUP]jα[/SUP] x cos(ωt - (2π/3))) + ((e[SUP]jα[/SUP])[SUP]2[/SUP] x cos(ωt + (2π/3)))


Am I on the right track?

 

[Silly Sausage]

Dennis,

There is a much more simpler way, love your use of the awesome number that is e!

Hint... Y is -0.5 + j0.866

 

[D Skelton]

Dennis,

There is a much more simpler way, love your use of the awesome number that is e!

Hint... Y is -0.5 + j0.866

Dennis it is not,

Yes I guessed, but I assumed you wanted the beans! lol, you did afterall ask for it in complex form

Oh and BTW, with regards to your earlier transposition of the formula I posed, it was only your G and your G[SUP]2[/SUP] values that were the wrong way round, I'd put that down to a brain fart rather than a lack of understanding

p.s, the 'D' has satanical connotations and you've only got six hundred and sixty six guesses

 

[Silly Sausage]

Damian

My head is full of gas.

 

[RmBo_0]

Transposition of formulae, I actually enjoyed it. A lot of my colleague buddies didn't though.

 

[Geordie Spark]

Damian

My head is full of gas.

Mine's full of s..t - but you already knew that.

 

[Silly Sausage]

Mine's full of s..t - but you already knew that.

I use the forum to learn new information.
Stop wasting my valuable time!

 

[Geordie Spark]

I use the forum to learn new information.
Stop wasting my valuable time!

Yes pet .... sorry pet.

 

[Silly Sausage]

Yes pet .... sorry pet.

If you think I'm TB I would go and seek professional advice at the earliest possible opportunity.
Unless North Eastern women look anything like me, you might have got lucky! hahahahaha

 

[Geordie Spark]

If you think I'm TB I would go and seek professional advice at the earliest possible opportunity.
Unless North Eastern women look anything like me, you might have got lucky! hahahahaha

Oops ............. sorry mate - it's force of habit.

TB isn't a North Eastern woman ..... she's a Staffordshire Pikey lass - heiress to a Dodgem Track, Shooting Gallery & Roll a Penny stall. :smug:

 

[Silly Sausage]

Does she call you Duck all the time?

I've now this image of you and ?????????? curled up in an alleyway, whispering sweet nothings into their ear, then they turn round and give you a big kiss with their rotting kebab infested beard.

 

[Geordie Spark]

Does she call you Duck all the time?

I've now this image of you and ?????????? curled up in an alleyway, whispering sweet nothings into their ear, then they turn round and give you a big kiss with their rotting kebab infested beard.

Nah ..... she calls me Geordie most of the time ........ other times it's unrepeatable.

She doesn't have a beard, she shaves every morning.

 

[Silly Sausage]

You can tell me, I'm broad minded!
Razor wise, on my weekly shave there is nothing more annoying than a blunt shaver clogged up with female moustache and armpit hair.

edit...

No south americans in south manc!

 

[D Skelton]

Ok, me thinks a much easier one for the more technically minded as opposed to the mathematically minded.

L1 is drawing 46.21A
L2 is drawing 12.5A
L3 is drawing 87.98A

Calculate the neutral conductor current. Notice the critical word in that sentence, so that means no vector diagrams and no cheating, I want to know the exact value, to 10 decimal places.

Archy, you're banned from doing this

 

[tidyboiler]

Oops ............. sorry mate - it's force of habit.

TB isn't a North Eastern woman ..... she's a Staffordshire Pikey lass - heiress to a Dodgem Track, Shooting Gallery & Roll a Penny stall. :smug:

Don't forget the Fun House!!! :24:

 

[Darkwood]

Ultimately no matter how complex the sum is the only answer that means anything is 42!

 

[tomplumbuk]

this thread is making my head hurt and I got a degree in applied physics!