Notice: Undefined index: vermogen in /home/TeunV/http/stroomsterkte-antwoord (2).php on line 2 Notice: Undefined index: weerstand in /home/TeunV/http/stroomsterkte-antwoord (2).php on line 3 Notice: Undefined variable: stroomsterkte in /home/TeunV/http/stroomsterkte-antwoord (2).php on line 8 0