Ohm's Law LED Lab

Have you ever wondered why we always put a resistor next to an LED? It’s not just because the book says so — it’s because an LED is greedy! If you let it drink too much current, it burns out in a flash. 💥

I built this little lab so you can try it yourself. Slide the battery voltage up and down, pick different resistors, and watch the current meter. There’s even a button that picks a safe resistor for you!

Here’s the big idea:

• Voltage (V) is the push from the battery
• Current (I) is how much electricity actually flows
• Resistance (R) is how narrow the path is

Ohm’s Law ties them together: V = I × R

If you cover the letter you want to find in the triangle, the rest shows you the sum. Try it — and don’t forget to hit the green button if your LED keeps popping! 😄

📺 Watch my video about this!

I made a video explaining exactly how Ohm’s Law works and how I use it to pick the right resistor. Check it out: