### Video Transcript

The diagram shows three identical
cells connected in parallel. The total emf provided by the cells
is six volts. What is the emf provided by each
cell?

Whenever we need to relate the
total emf provided by a parallel combination of cells to the emf provided by each
cell individually, there is one relationship we should think of immediately. If cells in parallel have the same
orientation and the same emf, then the total emf of the parallel combination is the
same as the emf of each cell individually. From the question, we know that the
three cells are identical, which means by definition they have the same emf.

Looking at the diagram, we see that
all three cells have the positive terminal on the right and the negative terminal on
the left, which means they have the same orientation relative to the direction that
current would have if these cells were connected to a circuit. So all of the cells have the same
orientation and the same emf, which means that the total emf of this combination
must be the same as the emf of each individual cell. We already know from the question
that the total emf is six volts. And since the total emf is the same
as the emf of each cell, the emf of each individual cell in this parallel
combination is six volts.