Regarding the power consumption, you can use a software like
HW Info to check how many Watts your CPU is using when idle and when mining and then do the calculations to see if mining is worth it for you.
Thanks for the link I'll check it out later.
Ok I've had time to do that now. just a quick question on interpreting the information. CPU power has 3 different values:
CPU Package Power
IA Cores Power
GT Cores Power
The last one is the onboard graphics and the value doesn't change when mining. My question is Package Power the total or do I need to add it to Cores Power?