I copied that url from the image window when i try to insert images. I guess that is not right either.
Is there any info on this site to show how to achieve this?
new window?
You mean make a post as I did initially, then open the image by clicking on it (the thing you don't wish to do) and copying that url. Then making another post and by using that url. Just tried that above with no joy and seems strange solution?
I'd be tempted to repeat my previous answer but maybe you've made a mistake and the previous formula gives the peak voltage? Sorry I can't help you perhaps you could try Wikipedia?