USB was designed to standardize the connection of computer peripherals (including keyboards, pointing devices, digital cameras, printers, portable media players, disk drives and network adapters) to personal computers, both to communicate and to supply electric power. It has become commonplace on other devices, such as smartphones, PDAs and video game consoles. USB has effectively replaced a variety of earlier interfaces, such as serial and parallel ports, as well as separate power chargers for portable devices. 

Unlike other data cables (e.g., Ethernet, HDMI), each end of a USB cable uses a different kind of connector; a Type-A or a Type-B. This kind of design was chosen to prevent electrical overloads and damaged equipment, as only the Type-A socket provides power. There are cables with Type-A connectors on both ends, but they should be used carefully. Therefore, in general, each of the different "sizes" requires four different connectors; USB cables have the Type-A and Type-B plugs, and the corresponding receptacles are on the computer or electronic device. In common practice, the Type-A connector is usually the full size, and the Type-B side can vary as needed.
How many types of connectors are there for USB cords?
What are they?
Where do you find them?
What part of the cord is the connector on?
Which type plugs into the power source?
Do cords usually have both types?
Why?
How should treat a cord with two type A ends?
Which type is the big end?
Can the other one be different sizes?
What was the USB originally for
Do smartphones use them?
What kind of port did they replace?
Besides supplying power what else do the do?
What is a keyboard?
What kind of computer was a USB made for?
Does it provide the communication link to the computer?
Can network adapters use them?
What about printers?
What are some other kinds of data cables?
Two
 Type-A and Type-B plugs
Type A and B
Type-A and Type-B plugs
computer or electronic
computer or electronic device.
Type-A or a Type-B.
USB cable uses a different kind of connector; a Type-A or a Type-B.
Type-A
Type-A socket provides power.
yes
There are cables with Type-A connectors on both ends
prevent electrical overloads and damaged equipment
This kind of design was chosen to prevent electrical overloads and damaged equipment
carefully.
Type-A connectors on both ends, but they should be used carefully.
Type-A
Type-A connector is usually the full size, and the Type-B side can vary as needed.
yes
Type-B side can vary as needed.
connection of devices
standardize the connection of computer peripherals
yes
ommonplace on other devices, such as smartphones, PDAs 
serial and parallel ports,
 USB has effectively replaced a variety of earlier interfaces, such as serial and parallel ports,
connection of devices
 connection of computer peripherals
computer part
connection of computer peripherals
personal computers
o personal computers, both to communicate and to supply electric power.
yes
 personal computers, both to communicate
yes
ncluding keyboards, pointing devices, digital cameras, printers, portable media players, disk drives and network adapters
yes
(including keyboards, pointing devices, digital cameras, printers, portable media players, disk drives and network adapters
Ethernet, HDMI
 Ethernet, HDMI