Chapter 3 Memory Cards: Work, Energy, and Power 🃏

A fun way to review the concepts in this chapter: either check the cards with yourself, or play with a timer and score. The more you play, the higher your best score will be saved.

You have two modes 🎮

• 🎴 Card Review — Look at the card, think, check the answer, and say whether you knew it or not. Great for calm review and deep learning.
• ⚡ Quick Game — 14 questions, each with its own specific time (conceptual questions are faster, calculation ones take more time). Score + streak.

💡 Note: Your progress is saved in this browser (no sign-up required).

---

---

Why does this method work? 🧠

This is a well-known method from learning psychology called active recall. Instead of just re-reading the text (which tricks your brain into thinking “I know this”), you challenge yourself. When you truly try to find the answer, whether you get it right or wrong, your brain stores the concept more firmly.

So don’t just read — test yourself 💪.