歡迎來到Yogi老師解題給你看，今天我要講解的是AP Physics C Electricity and Magnetism的問題
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?