A 12V electric motor is a type of electric motor that runs on 12 volts of direct current (DC) power supply. It can be used with Arduino, which is a popular microcontroller platform for hobbyists. To use a 12V electric motor with Arduino, you need some components, such as a 12V battery or power supply, a transistor or a relay, a diode, a resistor and some wires. You also need to write some code to control the speed and direction of the motor.