Vibration principle
The vibration of the mobile phone is produced by an eccentric wheel driven by a small motor. When rotating, the force is uneven, which causes the mobile phone to shake left and right because of centrifugal force. This kind of power is quite large for mobile phones. In fact, it is doing work and converting electric energy into mechanical energy.
power consumption
Vibration certainly consumes more electricity than amplifying the bell. Because vibration needs to consume more electricity to drive the small motor, and the size of the bell can only be realized by increasing the current, relatively speaking, it consumes much less electricity.
The principle of colored lights
Of course, it takes more electricity to turn on colorful lights than to turn them off, but it's not so exaggerated. The principle of colorful lights is very simple, which is realized by LED lights. Relatively speaking, the power of LED lamps is relatively small, so it will not consume too much power to drive colorful lamps.