Electricity transported through air: Ultrasonic waves guide sparks in new experiment

Scientists have guided electric sparks using ultrasonic waves for the first time. The sparks heat and expand air, directed by sound waves, allowing precise control around obstacles and into specific targets, including non-conductive materials. This method is safer and more cost-effective than laser-based approaches. Potential applications include high-voltage switching, plasma treatments, and a possible contactless Braille system. Researchers successfully guided a 4 cm electric spark around an obstacle using ultrasonic fields.