Charles-Augustin de Coulomb

Hello, my name is Charles-Augustin de Coulomb. I was born a long time ago, on June 14th, 1736, in the beautiful country of France. Even when I was just a boy, my head was filled with questions about how the world worked. I especially loved learning about numbers and science. I wanted to understand the world's secrets. Because I loved solving puzzles so much, I decided to go to a special school to become an engineer. An engineer is a very clever problem-solver who designs and builds all sorts of amazing things, like bridges and buildings, to help people.

My job as a military engineer was a grand adventure. In 1764, I sailed across the big blue ocean to an island called Martinique. My important mission was to help build a huge, strong fort to keep the island safe. But being an engineer wasn't just about stacking bricks and wood. It was about understanding things very deeply. I studied how strong different materials were so our fort wouldn't fall down. I also became very curious about something you can feel every day but can't actually see. It's called friction. In 1781, I wrote down all my ideas about this force. Friction is what makes things stick or slow down when they rub together, like when your shoes grip the floor so you don't slip.

What fascinated me the most were the invisible forces of electricity and magnetism. How could something you can’t see push or pull another object? To find out, I knew I needed a special tool. So, in 1784, I invented a very delicate machine that I called the torsion balance. You can think of it like a special scale for measuring the tiniest, softest pushes and pulls—forces as gentle as a whisper. Using my new invention, I made a huge discovery in 1785. I found a secret rule about electricity. I learned that some tiny electrical particles pull toward each other, while others push away from each other, just like the ends of two magnets. This important rule was named Coulomb's Law after me, and it helped everyone understand electricity so much better.

After a life full of discovery, I lived to be 70 years old. Even though I am no longer here, my work is all around you. Every time you flip a light switch to brighten a room or charge a tablet to play a game, you are using the science of electricity that I helped to explain. To honor my work, scientists even named the special unit they use for measuring electric charge the 'coulomb.' My ideas helped light up the world.