Two cells of emfs 1 V and 2 V and internal resistances 2 Ω and 1 Ω, respectively, are connected in parallel with the same polarity and supply a current of 1 A through an external resistance R. The polarity of the 1 V cell is then reversed while the external resistance remains unchanged. If the new current through R is α ÷ 5 A, find α.
Physics · Current electricity · combination of cells and maximum power theorem
Two cells of emfs 1 V and 2 V and internal resistances 2 Ω and 1 Ω, respectively, are connected in parallel with the same polarity and supply a current of 1 A through an external resistance R. The polarity of the 1 V cell is then reversed while the external resistance remains unchanged. If the new current through R is α ÷ 5 A, find α.