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Tutorial Shows Joule Thief Extracts Power From Dead AA

8/19/2026

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Summary

Story summary

A tutorial shows how to extract remaining energy from a 1.5-V AA battery with a joule thief circuit.
The guide says a dead battery still holds chemical energy and a non-zero voltage.
The circuit powers a small incandescent bulb through a single copper wire, lengthening its illumination.
The article ties the joule thief’s operation to Faraday’s law of induction, also used in generators and induction-cooking stoves.

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Story summary

A tutorial shows how to extract remaining energy from a 1.5-V AA battery with a joule thief circuit.
The guide says a dead battery still holds chemical energy and a non-zero voltage.
The circuit powers a small incandescent bulb through a single copper wire, lengthening its illumination.
The article ties the joule thief’s operation to Faraday’s law of induction, also used in generators and induction-cooking stoves.