Conductors and Insulators

Hi there. Have you ever thought about how electricity gets from one place to another. It’s all because of me and my best friend, who is my total opposite. I’m like a super-fast waterslide for tiny bits of energy. Whee. I let them zip and zoom wherever they need to go. My friend, though, is like a big, comfy armchair. When the energy gets there, it says, “Stop. Time to rest.” I’m the 'Go, Go, Go.' team, and my friend is the 'Whoa, slow down.' team. You can’t have one without the other. We work together to make sure energy goes exactly where you want it to, and nowhere else. We’re a secret team you use every single day.

For a long time, people knew about sparks and static, but they couldn't control them. Then, a very curious scientist in England named Stephen Gray had an idea. Around the year 1729, he started doing experiments. He discovered that if he used a metal wire, he could send a little spark of electricity all the way across a room. But when he used a silk thread to hold up his wire, the electricity stopped right there. It wouldn't cross the silk. He realized that some materials were on the 'Go Team' and loved to let electricity pass through, while others were on the 'Stop Team' and kept it from moving. He was the first to show the world our special jobs. He gave us our names: I am a Conductor, because I 'conduct' energy, and my friend is an Insulator, because it 'insulates' or holds energy in.

Today, you see our teamwork everywhere. Look at the cord on a lamp. Inside, there's a metal wire—that's me, the Conductor, carrying power from the wall to the lightbulb. But the colorful plastic coating on the outside. That's my partner, the Insulator. It keeps the electricity safely inside the wire so you can touch the cord without getting a shock. Without insulators, electricity would be messy and dangerous. But with both of us working together, we can power your video games, your family’s car, and the lights that help you read at night. So next time you flip a switch, remember us—the Conductor and the Insulator, the best team in the world, working together to keep your world bright and safe.