I’m not sure if I learn something new every day. But I sure learned something today! According to the wikipedia article List of Battery sizes, the all too familiar AAA battery was introduced in 1911 and added to the ANSI standard in 1959. The AA battery was introduced in 1907 and added to the ANSI standard in 1947.
Believe it or not, the D battery was first used in flashlights in 1898 – that is more than a century ago. My oldest grand parent was born in 1910!
The reason I find this amazing is because I had never seen a AAA battery before 1998! I grew up in India and have seen the AA, D, C and 9V batteries. Naturally, or perhaps naively, when I first saw the AAA battery in the US (most likely after the year 2000), I thought it was a new format.
I was looking for solar panels for my son’s science project. He seems to be very interested in Alternative Energy. Here is his quick sketch of a solar powered toy car.
It shows the components on the bottom – a solar panel, a fan that is powered by the solar panel, and a car with a sail on top. Of course once the car moves away from the fan, the wind will not get to the sail. But I suppose he will mount the fan on the car if it were a real car :).
He will learn something new when he tries it out I suppose.