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Question Video: Recognize That the Emf of an Individual Cell Connected in Parallel with Other Identical Cells Is Equal to the Total emf Science

Nine identical cells are connected in parallel and are all aligned in the same direction. The total emf provided by the cells is 18 V. What is the emf provided by one cell?

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Video Transcript

Nine identical cells are connected in parallel and are all aligned in the same direction. The total emf provided by the cells is 18 volts. What is the emf provided by one cell?

First, let’s make a sketch of the information given and what the question asks.

The question asks about nine identical cells connected in parallel. In our diagram, we will show that the positive terminals of all the cells are all connected together on the same side. And all of the negative terminals are connected together as the cells are all aligned in the same direction. The total electromotive force provided by the cells is 18 volts.

The question asks us for the emf provided by any one cell. So we have to think about what happens when cells are connected in parallel. We know the cells must all have the same emf values because the question states that the cells are identical. When identical cells are connected in parallel, the total emf supplied to the circuit is the same as the emf of any of the cells, and the total current produced is the same too. This is because the potential difference between points one and two is the same for all paths that we choose in the circuit. It doesn’t matter which cell we pass through to go from point one to point two.

The total emf supplied to the circuit is 18 volts. So we know that all the cells, which are connected in parallel, all supply the same emf as the total emf. Any one of the cells supplies an emf of 18 volts.

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