You're learning as a guest — your progress won't be saved. Sign in
0/13 doneIntro
Activities in this lesson
2.1 · Why learn this? The two-charger puzzle
Course outline
🔌
The two-charger puzzle
You have two chargers: one is labelled 5 V – 1 A, and a fast charger is labelled 9 V – 2 A.
- Why does the second one charge almost 4 times faster?
- Why do cheap charging cables often get hot?
Both questions are answered by two formulas in today's module.