In the image, three cells are arranged in a circuit. But the cell in the centre is installed such that the positive terminal is connected to the positive terminal of one cell and the negative terminal is connected to the negative terminal of the other cell.
What does this mean for the total EMF and resistance of the cells?
I speculate that the total EMF and resistance will be calculated as though the centre cell were connected in parallel to the other two. Assuming each cell has an EMF of 1.5 V and constant internal resistance of 2 ohms, this would give a total resistance of 4/3 ohms.
As for the equivalent EMF, I speculate the EMF for the centre cell would be -1.5 V and then the total EMF would be +1.5 V. Is this calculation correct?