CIE AS Physics (9702) exams from 2022

Revision Notes

1.2.3 Measurement Techniques

Measurement Techniques

  • Common instruments used in Physics are:
    • Metre rules – to measure distance and length
    • Balances – to measure mass
    • Protractors – to measure angles
    • Stopwatches – to measure time
    • Ammeters – to measure current
    • Voltmeters – to measure potential difference
  • More complicated instruments such as the micrometer screw gauge and Vernier calipers can be used to more accurately measure length


Measuring Instruments, downloadable AS & A Level Physics revision notes

  • When using measuring instruments like these you need to ensure that you are fully aware of what each division on a scale represents
    • This is known as the resolution
  • The resolution is the smallest change in the physical quantity being measured that results in a change in the reading given by the measuring instrument
  • The smaller the change that can be measured by the instrument, the greater the degree of resolution
  • For example, a standard mercury thermometer has a resolution of 1°C whereas a typical digital thermometer will have a resolution of 0.1°C
    • The digital thermometer has a higher resolution than the mercury thermometer


         Measuring Instruments Table

Measuring Instruments Table, downloadable AS & A Level Physics revision notes

Micrometer Screw Gauge

Micrometer Screw Gauge, downloadable AS & A Level Physics revision notes

How to operate a micrometer


Vernier Calipers

Vernier Calipers, downloadable AS & A Level Physics revision notes

How to operate vernier calipers


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