Measurement Devices

Measurement Devices


  • An Ammeter is used to measure the current passing through a circuit.
  • It should always be connected in series with the component where the current is being measured.
  • The SI unit of measurement used by an ammeter is amps (A).


  • A Voltmeter is utilised to measure the potential difference, or voltage, across components.
  • Voltmeters should always be connected in parallel across the components where the voltage is being measured.
  • Measurements are taken in volts (V).


  • An Ohmmeter is used to measure resistance in a circuit or individual components.
  • To measure resistance accurately, the component needs to be disconnected from the circuit.
  • Measurements by an ohmmeter are in ohms (Ω).


  • A Multimeter is a versatile device that can measure current, voltage, and resistance.
  • It can be used both in series and parallel, depending on what is being measured.
  • It offers a practical solution when multiple measurements need to be taken in a circuit.


  • An Oscilloscope displays a graph of an electrical signal, allowing for the measurement of properties such as amplitude, frequency, and time period.
  • It is mostly used in complex and high frequency circuits.
  • Oscilloscopes can help detect irregularities and troubleshoot in a circuit.

Signal Generator

  • A Signal Generator is used to produce electrical signals in the form of a wave.
  • These signals can be in the form of sine waves, square waves, or other complex waveforms.
  • Signal generators are mainly used for testing and troubleshooting in electronics and signal processing.