Ze Values? HELP

[Deleted member 72666]

Hi,dude, You will have to grow a sense of humour,as you have only had 20% of the 100% normally given,which is,after all,only one seventh....:conehead:

But is that higher or lower than 100%?

 

[davesparks]

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?

Around about now my dear old physics teacher would be tearing a few strips off you!

 

[newtothis]

The zero is relevant to the outcome of the calculation as it will have an impact on its accuracy.
0.8 x 0.320 = 0.3
0.80 x 0.320 = 0.26
0.800 x 0.320 = 0.256

0.8 is a value anywhere between 0.75 and 0.84 wheras 0.80 is a value between 0.795 and 0.804

Thanks for replying - it's appreciated, I'm a bit confused cos my calcs show the number of zeros is irrelevant.
I suspect it's expressed as 0.8 because that's what it is. If it was 0.802 then this would have to be noted
that 0.8 is correct to x decimal places. ??

0.8x 0.320 = 0.256
0.80=0.320 = 0.256
0800x0.320 = 0.256