Video Transcript
The diagram shows four identical
cells connected in series. The total emf provided by the cells
is eight volts. What is the emf provided by one
cell?
In this question, we are shown four
identical cells connected in series. The question states that the total
emf produced by these four cells is eight volts. We know that when components are
connected in series, there is only one path that an electric current can take
through the components. The cells are connected in series,
so the single path that current can take must pass through all of the cells. Since the cells are identical, they
must have equal emf, and the sum of their emf is eight volts. Dividing both sides of this
equation by the number of cells, four, we find that each cell individually produces
an emf of eight volts divided by four, or two volts. This is the emf provided by one
cell.
