HW34#2 – Two identical batteries of emf and internal resistance are to be connected to an external resistance R, either in parallel

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Two identical batteries of emf ℰ = 12.4 V and internal resistance r = 0.230 Ω are to be connected to an external resistance R, either in parallel.

(a) If R = 2.00r, what is the current i in the external resistance in the parallel and in the series arrangements?

(b) For which arrangement is i greater?

(c) If R = r/2.00, what is i in the external resistance in the parallel and series arrangements?

(d) For which arrangement is i greater now?