Ze Values? HELP

davesparks · Mar 24, 2015

Paul.M said:
Yes mate. If the 2nd, 3rd 4th etc decimal place is not required, dont need to use it or it would become 0.800000 or 0.8 X 10 to the power of minus 6 (level 3 maths, you will see)

^^ that is correct isn't it gents? Been a long time since writing this form of equation and it does not look right?

Yes you do, the number of decimal places displayed is significant in any calculation as it defines the accuracy of the end result. There's no point using a good quality tester which reads to 2dp then only recording the result to 1dp, you might as well use a less accurate tester.

Oh and 0.8 x 10 to the -6 would be 0.000008

(Or it might even be 0.00000008, thanks Mr styrofoam)

davesparks · Mar 24, 2015

Des 56 said:
This is getting too in depth,anyone know if my maths are right,I seem to keep getting e=mc squared

Special!

Des 56 · Mar 24, 2015

davesparks said:
Special!

Relatively speaking lol

davesparks · Mar 24, 2015

I'm glad you got that!

Paul.M · Mar 24, 2015

davesparks said:
Oh and 0.8 x 10 to the -6 would be 0.000008

I'm laughing my man ----- off right now :rofl: What a simple mistake! Knew it did not look right when I typed it, it's been a long day.

Des 56 · Mar 24, 2015

Paul.M said:
I'm laughing my man ----- off right now :rofl: What a simple mistake! Knew it did not look right when I typed it, it's been a long day.

Well done for positioning your point

[ElectriciansForums.net] Ze Values? HELP

Sorry, I mean pointing out your position

Silly Sausage · Mar 24, 2015

davesparks said:
Oh and 0.8 x 10 to the -6 would be 0.000008

You might want to edit that! :smilielol5:

Paul.M · Mar 25, 2015

Des 56 said:
Well done for positioning your point

Sorry, I mean pointing out your position

Lets not take this thread off track by talking about my hairy man ----- lol.

davesparks · Mar 25, 2015

Archy Styrigg said:
You might want to edit that! :smilielol5:

Yeah, I was still closer than Paul though

Paul.M · Mar 25, 2015

davesparks said:
Yeah, I was still closer than Paul though

No your not! 0.8 x 10 -6 =2!!!! :rofl:

It's to late for this, I'm off to bed lol.

PEG · Mar 25, 2015

...This is why that Mars lander bounced off in to the yonder....

"By calculation", 0.8 x 0.320 = 0.256 not 0.3

By restraint of scale,rounding down etc,yes,but NOT by calculation,which by its' description,is definitive.

0.8 x 10 to the -6 is 0.0000008 or 8 to the -7 , the power of -6 being a millionth,micro or multiple of 0.000001.

...And,as my maths teacher was inclined to ask,after a grueling,set of calcs,"We know friction makes heat?...and heat boils water?...So how long will it take a donkey to ---- a bucket of water,so we can have a cup of tea?" :icon12:

telectrix · Mar 25, 2015

PEG said:
...This is why that Mars lander bounced off in to the yonder....

"By calculation", 0.8 x 0.320 = 0.256 not 0.3

By restraint of scale,rounding down etc,yes,but NOT by calculation,which by its' description,is definitive.

0.8 x 10 to the -6 is 0.0000008 or 8 to the -7 , the power of -6 being a millionth,micro or multiple of 0.000001.

...And,as my maths teacher was inclined to ask,after a grueling,set of calcs,"We know friction makes heat?...and heat boils water?...So how long will it take a donkey to ---- a bucket of water,so we can have a cup of tea?" :icon12:

about 15 minutes if the donkey's on ------,

davesparks · Mar 25, 2015

PEG said:
...This is why that Mars lander bounced off in to the yonder....

"By calculation", 0.8 x 0.320 = 0.256 not 0.3
:

Ok I should have said 0.8ohms x 0.320 =0.256

In any scientific calculation an answer cannot be more accurate than the least accurate input value.

Paul.M · Mar 25, 2015

I would not drink it though

HandySparks · Mar 25, 2015

davesparks said:
Ok I should have said 0.8ohms x 0.320 =0.256

In any scientific calculation an answer cannot be more accurate than the least accurate input value.

Indeed, but you shouldn't make any assumptions about accuracy based only on the number of decimal places or significant figures used.

See my post here: http://www.electriciansforums.co.uk...0424-three-phase-calculation.html#post1079853

My multimeter shows values to 4 significant figures. Can I assume that it's accurate to plus/minus half of the final digit? No! But I still might write down the value I see on the display.

Here's another (silly) example: Would a shop selling something for £1.49 accept a "one pound" coin (0 decimal places), since it's not labelled as a "£1.00" coin?

Ze Values? HELP

davesparks

davesparks

Des 56

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davesparks

Paul.M

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Des 56

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Silly Sausage

Paul.M

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davesparks

Paul.M

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PEG

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telectrix

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davesparks

Paul.M

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HandySparks

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