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How to Make Your Own Transformers Transformers are electronic devices that can change the voltage and current of an electrical circuit. They are used in a wide variety of applications, from power supplies to audio equipment. You can make your own transformers using a few simple materials. Materials Two pieces of soft iron or steel rod, each about 6 inches long A coil of wire A battery A light bulb Electrical tape Instructions 1. Wrap the wire around one of the pieces of iron or steel rod. The number of turns of wire will determine the voltage ratio of the transformer. For a step-down transformer, you will need more turns of wire on the primary coil than on the secondary coil. For a step-up transformer, you will need fewer turns of wire on the primary coil than on the secondary coil. 2. Connect the ends of the wire to the battery and light bulb. The light bulb should light up. 3. Wrap the other piece of iron or steel rod around the coil of wire. The light bulb should dim.
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