Emergency Torch Efficiency Experiment. #experiment #science #electronic

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In this project, I used a homemade toroidal coil wound with 28 gauge enameled copper wire.
The coil has 11 turns – 0 – 11 turns (a center-tapped design), perfect for a boost circuit like a Joule Thief.

For switching, I used a CL100 NPN transistor, which handles higher current than small signal transistors.
On the base, I used a 100Ω resistor to limit current and control the transistor's switching.

The power supply is a 3V battery (2×1.5V cells), and the output drives 4 white LEDs in parallel — each one rated around 3V.
Even with this simple setup, all 4 LEDs glow brightly using just a 3V input, thanks to the voltage-boosting coil and efficient switching of the CL100 transistor.

🛠️ This kind of circuit is great for torches or emergency lights where you want to run multiple LEDs from a low-voltage battery."


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✅ Optional On-Screen Caption Ideas:

"Coil: 28 SWG Copper Wire, 11-0-11 Turns"

"Transistor: CL100 NPN"

"Base Resistor: 100Ω"

"LEDs: 4× 3V White LEDs in Parallel"

"Power: 3V (2 AA Batteries)"



I built a simple Joule Thief circuit to test battery performance. I used the exact same setup on both sides — same white LED, same coil, same transistor — but with different batteries: Duracell on one side, and Eveready on the other.

After running both setups continuously for 3 days, I noticed something interesting —
👉 The LED powered by Duracell was still glowing bright,
👉 While the one using Eveready had dimmed by around 30%.

This clearly shows that Duracell batteries are more efficient.

Why?

✅ Duracell has higher capacity (up to 2500mAh)
✅ Lower internal resistance, so there's less voltage drop under load
✅ And they’re better suited for high-drain circuits like the Joule Thief

On the other hand, cheaper Eveready batteries lose voltage faster, which reduces the LED brightness over time.

🎯 So if you're building a long-lasting, high-brightness torch or DIY project, I recommend using quality batteries like Duracell.
Cheaper batteries might work at first, but their performance drops quickly.

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