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• Amperage (Amps)


  A unit of measurement of electrical current flow
• Ampere


  A unit of measurement which describes the amount of electric current passing a certain point at a particular time
• Centimeter


  Hundredth of a meter
• Inch


  A portion of a foot, which is an English unit of linear measurement
• Megger


  An instrument used to measure the insulation resistance of conductors or wire. It gives measurement in ohms or meg-ohms
• Millimeter


  One-thousandth of a meter
• Multi-tester


  An electrical measuring instrument used to measure the voltage, the resistance or the current of a circuit. It is connected either through parallel or series with the circuit depending on what to measure
• Ohm


  The unit of measurement used to express resistance
• Ohmmeter


  An instrument used to measure resistance in ohms
• Volta


  Unit of measurement of electrical pressure or voltage
• Voltmeter


  An instrument specially designed for measuring voltage
• Wire Gauge


  Used to measure the diameter of magnetic wire
• System of measurement


  A set of units which can be used to specify anything that can be measured
• Common units of measurement used in making layout and installation of electrical materials

  • Linear measures
• Linear measures


  • Inch
  • Yard
  • Miles
• English system


  Provides the creative way on how people can measure by themselves, e.g. measuring shorter distance on the ground with their feet, measuring long distances by their palms which is equal to a yard
• Metric system


  • Millimeter
  • Centimeter
  • Decimeter
  • Meter
• Metric system


  A decimalized system of measurement, widely used around the world for personal, commercial and scientific purpose
• English units and each equivalent

  • 12 inches = 1 foot(ft)
  • 1 foot = 3 yard (yd)
  • 1 yard = 36 inches
• Metric units and each equivalent

  • 10millimeter (mm) = 1 centimeter (cm)
  • 10centimeter = 1 decimeter(dm)
  • 10 decimeter = 1 meter
• English to metric equivalent

  • 1 inch = 2.54 cm
  • 1 foot = 30.48 cm
  • 1 yard = 91.44 cm
• The centimeter graduation

  1. .5 MM

  2. .5mm

  3. 1mm

  4. 10mm or 1cm
• The graduation shows that every digit is .5mm
• How to read the cm graduation

  1. First graduation is .5 mm

  2. Second graduation is 1mm

  3. Third graduation is 1.5mm

  4. Fourth graduation is 2mm
• If the graduation reaches 10mm, it is equivalent to 1cm
• The inch graduation


  • 0
  • 1/8
  • 1/4
  • 3/8
  • 1/2
  • 12
  • 5/8
  • 3/4
  • 7/8
  • 1 inch
  • 1/16
  • 3/16
  • 5/16
  • 7/16
  • 9/16
  • 11/16
  • 13/16
  • 15/16
• How to read the inch graduation

  1. First graduation is 1/16

  2. Second graduation is 1/8

  3. Third graduation is 3/16

  4. Fourth graduation is 1/4, then follow the given scale above
• The inch graduation in a steel rule
• Converting the unit of measurement


  From English to metric and vice versa
• Example


  • 12 inches
  • 12 inches = 2.54 cm
  • 12 x 2.54 cm
  • 1 inch
  • cm
  • Cancel the common unit and apply cross multiplication
  • Perform the indicated operation
• Multitester

  Also called a multimeter, it is an instrument that can measure voltage, resistance and current
• Multitester

  • Made of two types: analog and digital
• Parts of a multitester

  • Pointer
  • Scale
  • Moving coil
• Range Selector Knob

  Selector switch that makes it possible to select different functions and range of the meter
• Pointer

  Needle-shaped rod that moves over the scale of a meter, mechanically connected to the moving coil, indicates the measured values
• Range Selector Knob

  • Selects different functions
  • Selects range of the meter
• Adjustment screw

  Makes it possible to adjust the pointer to the zero position of the scale
• Meter functions

  • DCV
  • OCA
  • 100
  • OO
• SCALE

  A series of markings used for reading the value of a quantity
• SCALE

  • Can have different types of scale
  • For voltage and current readings the scales have mostly linear division, which means equal