The figures linked to by Mrsdavidcaruso are interesting and even more so, if you do the 'better off calculation' at the bottom of the page.
If that same single mother got herself a job on NMW, it states that she would be a whole 5.75 PW better off, if she worked 10 hours a week. This does not include transport costs, so unless she could walk to work, she would be worse off working than being unemployed.
If she was working for 16 hours per week she would be 10.79 better of PW, again not including transport costs.
It would only let me do two calculations so it would be interesting if someone else could do the 24 hours and 37 hours per week that I was going to, as I think that working 24 hours per week may allow other tax credits possibly? and 37 hours PW is approximately full time.
Of course, someone with DCs working 24 hours or more per week are likely to then need childcare, which would worsen the figures.
So if JSA is insultingly low, it is even more insulting to a person working part time who could be just 10 PW better off than being unemployed, and are likely to be worse off once transport and other costs associated with working are taken into account.