It is called an rpm (revolution per minute) to the unit that is used to express the angular velocity. It is the number of complete turns a body gives around an axis.

PWM technically be the pulse-width modulation (also known as PWM stands for pulse-width modulation) of a signal or energy source. It is a technique in which the duty cycle of a periodic signal (a sine or a square, for example) is modified, either for transmitting information through a communications channel or to control the amount of power that is sent to a load. Pair

Commonly referred to as internal Molex connectors on a desktop computer. It is used for peripherals that require more amperage than that provided by the data cable such as:

• Hard drives (IDE, SCSI and SATA)
• Units diskettes (3.5 'and 5.25 ")
• Optical drives (CD, DVD and Blu-Ray)
• Video cards (PCI-e plates, PCI and AGP)
• Cooling systems (air and liquid)
• Modding circuits (LEDs, light pipes, etc.)
• Naturally, there are two types of Molex connectors, a male connector and a female connector. Plugs are used to branch outlets and split them into two but most of the time are integrated into the PCB peripherals.

The electrical conductors exiting the power supply toward Molex connectors have colorsdistinguish: