in the diagram below, the voltmeters are as near to perfect as possible, the cell has negligible internal resistance. the red blob is a conducting diode, and the green blob is non-conducting. the coloured boxes are resistors. in order to work out the current through the red diode, is it ok to redraw the circuit as shown on the left? i figured that as the voltmeters have very high resistance, there'd be virtually no current through them, and none at all through the green diode. is this an ok way of looking at it?