1. The problem statement, all variables and given/known data Circuit as shown: (sorry about the amazing paint skills) The pd is being applied from A to B (C is in the centre of the circle) (1) Determine the relations between the current by reversing V and using symmetry or by any other suitable method (2) Calculate the total resistance accross AB (3) Determine the magnitudes of the currents in terms of V (4) Redraw the circuit with CD as the base. If the pd is now applied across CD determine the resistance across CD (5) Redraw the circuit with AC as the base. Explain why the resistance across AC cannot be calculated in terms of resistances in series / parallel 2. Relevant equations 3. The attempt at a solution (1) Using Kirchoffs Current Law $$ I_1 + I_3 + I_5 = V/R_T \\ I_2 + I_4 + I_5 = V/R_T \\ I_3 + I_6 = I_4 \\ I_1 = I_2 + I_6 \\ $$ Using Kirchoffs Voltage Law $$ -2I_1-2I_2+2I_5=0 \\ -2I_1-3I_6+I_3=0\\ -I_3-I_4+2I_5=0\\ 3I_6-2I_2+I4=0\\ -I_4+2I_5-I_3=0\\ $$ (2) I can see that I can use the equations from (1) as simultaneous equations and therefore work out the resistance?