In your home, school, college or office, you must have noticed that some light #bulbs are #bright, while others are #dimmer.

But have you ever thought about exactly why that happens? There must be something different between the bulbs, but what is it, and why does it make them light up differently? To understand what is going on, we need to look back about 200 years to a #revolutionary_discovery made by a German man who played an important role in helping us to understand how electric #circuits work. That German man is our "scientist of the day" today.

It's the birthday of #GeorgSimonOhm, the man who discovered one of the most fundamental laws of electricity --

(Scientist of the Day - 16 March)

Ohm studied #mathematics and went on to become a mathematics teacher. One of the schools he taught at, the Jesuit Gymnasium in Cologne, had a well-equipped science lab. There, Ohm conducted a series of experiments with electricity, whose properties he described mathematically in his book, 'The Galvanic Circuit Investigated Mathematically' (1827). In this book, he gave his complete theory of electricity.

His most famous finding ...