Brains On! Science podcast for kids · Brains On Universe

Why do electric cars sound so unique?

October 28, 2025·28 min·2 clips

Jay Kapadia mixes sound colors and wave shapes to give electric cars their own musical language.

This episode of Brains On! answers a listener's question about why electric cars are so quiet. Host Molly Bloom is joined by kid co-host Asher from Wisconsin. They explore the science and design behind the unique sounds of electric vehicles. The episode explains that gas-powered cars like Iggy the Delivery Van have noisy internal combustion engines powered by small, controlled explosions. Electric cars like Elektra Sparks use batteries and electric motors, making them naturally much quieter. Laws passed in 2019 now require new electric vehicles to have external speakers to alert pedestrians. Sound designer Jay Kapadia from General Motors describes his job as being like a DJ, composer, and wizard. He creates "pedestrian friendly alerts" and interior sounds that prevent carsickness by matching the vehicle's speed. Kapadia uses synthesizers and real instruments, like a didgeridoo for a Cadillac's sound, to give each car a character. He follows safety rules ensuring sounds are audible but not scary and must work in all weather. Asher participates in a game show guessing if a sound is from a car or a household item, correctly identifying a car idling, an electric Corvette, and a turn signal. The episode includes a mystery sound of a candle burning, submitted by listeners Avery and Addison from Illinois. The tone is educational and playful, using character voices for vehicles and interactive segments. The style is conversational and engaging for young listeners, featuring sound effects, games, and expert interviews. Kids curious about technology, science, or cars would love this episode. Listeners preferring purely narrative stories without interactive game elements might skip it.

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