100 watts came from a unit that we use now for heating the liquid that this will be used for...
colin - you're correct! I've messed up somewhere
I've just gone through it again.....
I calculated W=V2/R
so.... I know my watts = 100 and my voltage is 230 ....... R= 52900/100
so.... R=529
The stirrer is 275mm long, 3mm diametre and the coils will be spaced at 4mm apart...
number of turns is.......275/4=68.75
so........... pi x diametre x number of turns
3.14 x 3 x 68.75 = 648mm
Total length of wire = 0.64 metres
ohms per metre is...... 529/0.64 = 826
Using the same calculations I found that 24v means I need 9 ohms/metre........ which sounds much more realistic...
Any thoughts? I've been staring at these sums for so long that I'm not not sure anymore
Thanks in advance....