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  2. 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 ...

  3. Battery indicator - Wikipedia

    en.wikipedia.org/wiki/Battery_indicator

    1966 Dodge Charger dashboard, note ammeter marked "Alternator" at top left. Some automobiles are fitted with a battery condition meter to monitor the starter battery.This meter is, essentially, a voltmeter but it may also be marked with coloured zones for easy visualization.

  4. 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.

  5. 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.

  6. Ammeter - Wikipedia

    en.wikipedia.org/wiki/Ammeter

    Demonstration model of a moving iron ammeter. As the current through the coil increases, the plunger is drawn further into the coil and the pointer deflects to the right. 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 ...

  7. Automotive head unit - Wikipedia

    en.wikipedia.org/wiki/Automotive_head_unit

    A single DIN head unit with a large retractable touchscreen, DVD and GPS. Central to a vehicle's sound and information systems, head units are located prominently in the center of the dashboard or console, and provide an integrated electronic package.

  8. 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.

  9. Vehicle audio - Wikipedia

    en.wikipedia.org/wiki/Vehicle_audio

    Some head units have built-in stereo amplifiers. Other car audio systems use a separate stand-alone amplifier. Every amplifier has a rated power level sometimes noted on the head unit with the built-in amplifier, or on the label of a stand-alone unit. Coaxial speakers: These are the most common type of car speakers and are often factory-installed.