Questions relating to the physical components that the Raspberry Pi consists of.

An overview of the Raspberry Pi board

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Component List

Model A

+-------------------------+------------------------+-----------------------+
| System-on-a-chip (SoC): | Broadcom BCM2835 (CPU + GPU + SDRAM)           |
| CPU:                    | 700 MHz ARM11 ARM1176JZF-S core                |
| GPU:                    | Broadcom VideoCore IV,OpenGL ES 2.0,OpenVG     |
|                         | 1080p30 H.264 high-profile encode/decode       |
| Memory (SDRAM)iB        | 256 MiB                                        |
| USB 2.0 ports           | 1                                              |
| Video outputs           | Composite video,Composite RCA, HDMI            |
| Audio outputs           | TRS connector 3.5 mm jack, HDMI                |
| Audio inputs            | None                                           |
| Onboard Storage         | SD / MMC / SDIO card slot                      |
| Onboard Network         | None                                           |
| Low-level peripherals   | General Purpose Input/Output (GPIO) pins,      |
|                         | Serial Peripheral Interface Bus (SPI), I²C,    |
|                         | I²S[2], Universal asynchronous                 |
|                         | receiver/transmitter (UART)                    |
| Real-time clock         | None                                           |
| Power ratings           | 500mA, (2.5 Watt)                              |
| Power source            | 5V via Micro USB or GPIO header                |
| Size                    | 85.60mm x 53.98mm (3.370 × 2.125 inch)         |
+-------------------------+------------------------------------------------+

Model B

Same as above with the following additions:

+-------------------------+------------------------------------------------+
| USB 2.0 ports           | 2                                              |
| Power ratings           | 700mA, (3.5 Watt)                              |
| Onboard Network         | 10/100 wired Ethernet RJ45                     |
+-------------------------+------------------------------------------------+
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