<span>When two or more identical capacitors (or resistors) are connected in series across a potential difference, the potential difference divides equally among them.
For example, if you have nine identical capacitors (or resistors) all connected end-to-end like elephants in a circus parade, and you connect the string to a source of 117 volts (either AC or DC), then you will measure
15+3=18km/hour Think about it like this. The boat is going 15 faster than the river, and the river is going 3 faster than the bank, so the boat is going 18 faster than the river bank