Power Supply

Power Supply
Power supply's come both internal and external. Internal power supplies consist of batteries and external power supplies consist of plugs and charging packs etc.

Internal
An internal power supply is always going to be a battery. This is when a computer, or other device is charged via the mains of a plug and then when it is fully charged unplugging it until the battery runs out. This is using the internal power supply. This means that users can walk around with the device or use it wirelessly without having to have wires hanging out of the device. This makes the devices easier to use. Small devices such as game boys use AA batteries but this is still classed as an internal power supply because power is being supplied by an internal source. Game consoles that use internal power supplies tend to have lower graphic content because if they had the full graphic content whilst running on battery power the power would drain very quickly which will mean the device will need charging again. 

External
An external power supply is always generally when a device is plugged into a main power source i.e. a plug charging a laptop. Devices run a lot quicker and have better graphics is they are externally plugged in. If you are using an external power supply this affects the portability which means that users can't use the devices wirelessly because they have to be sat near a plug socket to ensure the device is charging. Most new consoles i.e. Xbox 360, Xbox One, PS3 and PS4 all use external power supplies because it makes the device load quicker as well as the graphics being of a higher quality.