The emission of a high-frequency sound from a phone charger typically indicates the phenomenon of coil whine. This noise arises from the vibration of the charger’s internal components, specifically inductors or transformers, due to fluctuating electrical currents. This vibration occurs at a frequency within the audible range, manifesting as a high-pitched whine or squeal. For example, a charger powering a phone overnight may exhibit this sound, particularly when the phone’s battery is nearing full capacity and the current flow is more variable.
Understanding the origin and implications of this sound is beneficial for assessing the safety and reliability of electronic devices. Historically, coil whine has been associated with various electronic components, not limited to phone chargers, and has been a subject of engineering investigation aimed at mitigating its occurrence and potential negative impacts on device performance. Recognizing its presence allows for a more informed decision regarding the continued use or replacement of the device, ensuring user safety and preventing potential electrical hazards.
