Q: What is the name of the device that makes a mobile phone vibrate?

A: Like pagers and even some toys, a cell phone uses a tiny device called a DC motor to cause vibration. DC motors take electricity from a power source, such as the battery in a cell phone, and that energy is then converted into mechanical work. If you want more information you can read all about DC motors.

Tip: You may also wish to research AC motors and synchronous motors.