Hey there, future physicist! Let's delve into the exciting world of energy sources. 🌟

These are like the food for many of your gadgets. You know, the things that keep your flashlight shining and your playlist playing.

 Primary Cells

• What are they? These are the "one-time-use" kind of cells. Once they're out of juice, you throw them away.
• Real-world example: Think of it like a pre-packaged sandwich. Once you've eaten it, it's gone. Yummy, but no seconds!

Secondary Cells (Rechargeable)

• What's the deal? These cells are the gift that keeps on giving. Once they're out of power, you can recharge them.
• Types: Lead–acid, NiMH (Nickel–Metal-Hydride), and Lithium–ion. (You might've seen these in your laptop or phone specs!)
• Why are they cool? Over time, they're cheaper because you can reuse them instead of constantly buying new ones.
• Real-world example: They're like home-cooked meals! Once you finish, just cook again (or in this case, recharge).