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  2. Voltmeter - Wikipedia

    en.wikipedia.org/wiki/Voltmeter

    A voltmeter is an instrument used for measuring electric potential difference between two points in an electric circuit. It is connected in parallel . It usually has a high resistance so that it takes negligible current from the circuit.

  3. Short-circuit test - Wikipedia

    en.wikipedia.org/wiki/Short-circuit_test

    A wattmeter is connected to the primary side. An ammeter is connected in series with the primary winding. A voltmeter is optional since the applied voltage is the same as the voltmeter reading. Now with the help of a variac, the applied voltage is slowly increased until the ammeter gives a reading equal to the rated current of the HV side ...

  4. Ammeter - Wikipedia

    en.wikipedia.org/wiki/Ammeter

    An ammeter (abbreviation of ampere meter) is an instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. For direct measurement, the ammeter is connected in series with the circuit in which the current is to be measured.

  5. Class of accuracy in electrical measurements - Wikipedia

    en.wikipedia.org/wiki/Class_of_accuracy_in...

    The ammeter is used in series with the load, so the same current flows through the load and the ammeter. The voltmeter is used in parallel with the load, so the voltage between the two terminals of the load is equal to the voltage between the two terminals of the voltmeter. Ideally the measuring device should not affect the circuit parameters i ...

  6. Multimeter - Wikipedia

    en.wikipedia.org/wiki/Multimeter

    Every inline series-connected ammeter, including a multimeter in a current range, has a certain resistance. Most multimeters inherently measure voltage, and pass a current to be measured through a shunt resistance, measuring the voltage developed across it. The voltage drop is known as the burden voltage, specified in volts per ampere.

  7. Electrical measurements - Wikipedia

    en.wikipedia.org/wiki/Electrical_measurements

    Ammeter and Voltmeter on a power supply. Electrical measurements are the methods, devices and calculations used to measure electrical quantities. Measurement of electrical quantities may be done to measure electrical parameters of a system.

  8. Open-circuit test - Wikipedia

    en.wikipedia.org/wiki/Open-circuit_test

    The secondary of the transformer is left open-circuited. A wattmeter is connected to the primary. An ammeter is connected in series with the primary winding. A voltmeter is optional since the applied voltage is the same as the voltmeter reading.

  9. Electronic test equipment - Wikipedia

    en.wikipedia.org/wiki/Electronic_test_equipment

    Keysight commercial digital voltmeter checking a prototype. The following items are used for basic measurement of voltages, currents, and components in the circuit under test. Voltmeter (Measures voltage) Ohmmeter (Measures resistance) Ammeter, e.g. Galvanometer or Milliammeter (Measures current)

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