Units

• What is the focus of Section Two in the study material?

  Two-Dimensional Data Representation
• What units are mentioned for measuring distance?

  Centimeters, meters, and kilometers
• What do computers need units for?

  Measuring digital information
• What are bits in data representation?

  The smallest measure of data
• What do 1s and 0s represent in data flow?

  Electricity flowing or not flowing
• What must data be converted into for processing?

  Binary code (1s and 0s)
• What does each 1 or 0 in binary code represent?

  A bit (binary digit)
• How many bits are in the binary number 1010?

  4 bits
• What does the table below show regarding data units?

  • Size of other units of data:
  • Byte: 1 character (like x, e, M)
  • Bit: single binary digit (1 or 0)
  • Nibble: 4 bits
  • Kilobyte (kB): 1000 bytes
  • Megabyte (MB): 1000 kilobytes
  • Gigabyte (GB): 1000 megabytes
  • Terabyte (TB): 1000 gigabytes
  • Petabyte (PB): 1000 terabytes
• What is the size of a kilobyte?

  1000 bytes
• What is the size of a megabyte?

  1000 kilobytes
• What is the size of a gigabyte?

  1000 megabytes
• What is the size of a terabyte?

  1000 gigabytes
• What is the size of a petabyte?

  1000 terabytes
• Why is 1024 used instead of 1000 in some data measurements?

  It is a power of 2, helpful for binary data
• What can each bit take on in binary representation?

  One of two different values (1 or 0)
• What does the ability of a bit to take on two values imply for data representation?

  It allows for binary data encoding
• What is the value defined to be for the unit discussed?

  1024
• Why is 1024 considered useful in binary data?

  It is a power of 2
• How many different values can each bit take?

  Two values
• What does an nibbles represent in bits?

  4 bits
• How many different values can 4 bits represent?

  16 values
• How many different values can 8 bits represent?

  256 values
• What is the process of converting between different units of data usually like?

  Pretty straightforward
• What is the size of each image mentioned?

  300 kilobytes
• How many bits are in each image if each image is 300 kilobytes?

  2400000 bits
• How do you convert kilobytes to bytes?

  Multiply by 1000
• How many bits are there in a byte?

  8 bits
• What is the total size of all images in kilobytes?

  1200000 kilobytes
• How do you convert kilobytes to gigabytes?

  Divide by 1000
• What is the final size of the images in gigabytes?

  0.12 GB
• Does she have enough space to store the images on her USB drive?

  Yes, she has enough space