A really basic circuit problem which I just don't understand. In the attached figure, C is a cell of e.m.f. 2V and internal resistance 1 Ohm. Calculate: a) the current through A b) the current through B c) the p.d. between the terminals of the cell I really don't understand how to calculate the current through A. If someone could just help me with that then I'd appreciate it, I'm hoping that from someone pointing out what's probably obvious in part A, I'll be able to do B and C by myself.