What is Loss tangent (tan δ)?

Loss tangent (tan δ) is like how much energy gets lost when something moves through a material, kind of like how your shoes feel when you walk on different kinds of floors.

Imagine you're wearing socks and walking on a carpet. If the carpet is soft, it feels easy to walk on, not much resistance. But if it’s a rough, bumpy rug, your feet work harder with every step. That extra effort is like energy loss.

Now think about a material that electricity or light travels through, like a road for tiny particles. Sometimes, the road is smooth, energy moves easily. Other times, the road has bumps and potholes, energy gets lost as it goes through.

That’s where loss tangent comes in! It tells us how much of that energy gets lost compared to how much makes it through. A high loss tangent means more energy is being lost, like walking on a bumpy rug instead of a soft carpet.

If you think about a phone charging, or a lamp getting dim over time, those are signs of loss tangent in action, the material inside isn’t perfect, and some energy just disappears along the way.