Some more lovely electronics questions!! Yay!

Two more...

7) Current through R = 12 + 35 - 40
                                  = 7 mA

8) Voltage across R = 7 * 27
                                = 189 mV

And now, for some chess notation, because I'm bored... :-)
! - good move
!! - brilliant move
? - questionable move
?? - blunder, howler
?! - risky move
!? - interesting move

(I think)

cogito, ergo sum... :)