Electric tricycles usually have two sounds, one is the hum of the motor when the vehicle is running, and the other is the warning sound from the vehicle's horn.

1. Electric motor buzzing sound: Electric tricycles use electric motors as power sources, and the electric motors produce buzzing sounds when working. This is caused by the interaction between the electromagnetic coil and the rotor inside the motor. When current passes through an electromagnetic coil, a magnetic field is created, and the interaction between the magnetic field and the rotor creates sound.

Extension: The working principle of an electric motor is to convert electrical energy into mechanical energy, generate a magnetic field through the action of current, and then drive the rotor to rotate. The buzzing sound of an electric motor is the result of the interaction between electric current and magnetic field, and is also a sign of the normal operation of the electric vehicle.

2. Warning sounds emitted by vehicle horns: The horns of electric tricycles are usually used for traffic warnings or reminder signals. This is to remind other vehicles or pedestrians to pay attention to their presence during driving to ensure driving safety.

Expansion: The sound of vehicle horns usually has different pitches and volumes to convey different messages in different situations. Some electric tricycles are also equipped with a variety of warning sounds, such as horns, sirens, etc., for use in different situations.

In short, the horn of an electric tricycle emits a warning sound and the motor buzzes to remind people and vehicles around you to pay attention to yourself and ensure driving safety. At the same time, these sounds are also manifestations of the normal operation of the electric tricycle.