# Electric circuits (a) State the assumptions used to analyse circuits containing ideal operational am

Electric circuits

(a) State the assumptions used to analyse circuits containing ideal operational amplifiers regarding the voltages and currents at the terminals of the ideal operational amplifier (2 marks (b) Hence or otherwise, identify which nodes labelled as Vg, Vg, V,, V,, and V, in the y circuit in figure A2 are at the same voltage (2 marks) (c) Determine expressions for Vg in terms of V and Va and any necessary resistances (i) (ii) V in terms of V2 and V, and any necessary resistances, (iii the output current i, flowing in the load Z, in terms of the input voltages V and V and any necessary resistances (2 2 4 8 marks) Va R V +

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