Scales

• Linear Scale


  A scale that is equally divided
• Non-linear Scale


  A scale that is unequally divided
• Estimations cannot be made on a non-linear scale
• What is an Error?

  An Error is the difference between the actual value of a quantity and the value

  obtained in measurement.
• What are the two types of error?

  1. Systematic error
  2. Random error
• What are the types of systematic errors?

  1. Zero error
  2. An inncorrect calibration of an instrument
  3. consistently improperuse of equipment
  4. Reaction time in timing experiments
• How can Systematic Errors be REDUCED

  Systematic error can be reduced by

  1. Conducting the experiment with care.

  2. Repeating the experiment by using different instruments.

  3. Using countdown method for timing experiments.
• What is a Zero Error?

  Zero error

  Any indication that a measuring system gives a false reading when the true

  value of a measured quantity is zero,
• Time

  Second
• Temparature

  Kelvin
• Current

  Ampere
• Time

  Second
• Mass

  Kilogram
• What is a derived unit


  A unit that comes from something else