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.

What are the answers to this following set of questions:

1. How many types of connectors are there for USB cords?
2. What are they?
3. Where do you find them?
4. What part of the cord is the connector on?
5. Which type plugs into the power source?
6. Do cords usually have both types?
7. Why?
8. How should treat a cord with two type A ends?
9. Which type is the big end?
10. Can the other one be different sizes?
11. What was the USB originally for
12. Do smartphones use them?
13. What kind of port did they replace?
14. Besides supplying power what else do the do?
15. What is a keyboard?
16. What kind of computer was a USB made for?
17. Does it provide the communication link to the computer?
18. Can network adapters use them?
19. What about printers?
20. What are some other kinds of data cables?

Numbered answers:
1. Two
2. Type A and B
3. computer or electronic
4. Type-A or a Type-B.
5. Type-A
6. yes
7. prevent electrical overloads and damaged equipment
8. carefully.
9. Type-A
10. yes
11. connection of devices
12. yes
13. serial and parallel ports,
14. connection of devices
15. computer part
16. personal computers
17. yes
18. yes
19. yes
20. Ethernet, HDMI