Capacitance: phone box in Bellingham

In the days before mobile phones, this is what you used when you were out and needed to make a phone call. I found this one on a campsite at Bellingham in Northumberland. One student game was to see how many people you could fit into a phone box after an evening out. Entertainment wasn't as good in those days. I use this idea to explain the charging up of a capacitor. The first person goes in easily. It's harder for the second person because there is already someone in the space. In fact, every successive person makes it even harder to get another one in. It's like that with charge on a capacitor. Every added charge repels incoming charges more and makes it harder to add more. The rate of addition charge slows and eventually comes to a standstill when you can't add anymore. Thus the charging current falls exponentially.