Emily

__What’s the difference between internal and external buses?__ A bus is a pathway of wires and connectors that provides the link betwen input, storage, process and output devices. It is like a highway that data travels along within a computer. Internal buses are located on the motherboard and links the CPU and memory. These buses are photochemically etched layers of metal that create electric channels. Whereas, external buses connectes peripheral devices to the CPU and memory. If the expansion bus connects directly to the CPU and bypasses RAM, it is called a local bus. There are different types of expansion buses, such as ISA, EISA, VESA and PCI.
 * Buses**

__How do buses effect the speed of transmission and reception in a computer?__ The purpose of buses is to reduce the number of "pathways" needed for communication between the components, by carrying out all communications over a single data channel. The bus width, or size of the bus, determines the number of bits that can be transferred at one time. The larger the bus width, the fewer number of transfer steps required and the faster the transfer of data. Every bus also has a clock speed. The higher the bus clock speed, the faster the transmission of data, which results in applications running faster. The advantage of a bus is that it makes parts more interchangeable. If you want to get a better graphics card, you simply unplug the old card from the bus and plug in a new one. This therefore speeds up the transmission and reception in the computer.

__Find an image of an external and internal bus.__ Expansion bus Internal bus