A telephone ringer typically operates at a voltage of around 90 to 100 volts AC. This high voltage is used to ring the telephone bell or electronic buzzer, which alerts users of incoming calls. Voltage is applied to the ring circuit when the telephone receives a signal from the telephone exchange.
A doorbell typically operates over a voltage range of 8 to 24 volts AC. This low voltage is provided by a transformer which lowers the mains voltage to a safer level for the doorbell to operate.
This voltage range ensures that the doorbell chime or buzzer operates reliably without posing any risk to users.
The voltage of a telephone line is typically around 48 volts DC when the telephone is in use or on-hook. This voltage is supplied by the telephone exchange and is used to power the telephone circuits and signal transmission.
When the phone is off-hook, the voltage may drop as much as 6 to 12 volts DC, depending on line resistance and other factors.
A landline telephone typically operates with a voltage of around 48 volts DC when idle, and the voltage can drop significantly when the phone is off-hook, usually to around 6 to 12 volts DC.
The voltage supplied to the telephone line is used to power the telephone circuits and facilitate communication between the telephone and the telephone exchange.
A cell phone ringtone is an internal component of a cell phone that produces sound or vibration to alert the user of incoming calls, messages, or notifications. Unlike traditional landline phones, cell phones do not use high voltage for their ringtone. Instead, they rely on electronic circuits and low-voltage power from the phone’s battery to operate the ringtone.
The ringer feature is built into the phone’s design and is powered by the phone’s internal battery, typically operating at 3.7 to 4.2 volts DC.