Q:

What is a voltmeter used for?

A:

Quick Answer

A voltmeter is an instrument used to measure the voltage between two points in an electrical circuit. Some voltmeters register direct current while others measure alternating current.

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What is a voltmeter used for?
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Full Answer

There are two basic types of voltmeters: analog and digital, with digital being the more accurate of the two. An analog voltmeter is built with a galvanometer in series with a high resistance and the inter resistance of the voltmeter must be high. A digital voltmeter shows the voltage as numbers.

Voltmeters are used in a variety of different industries. They are common in laboratories and the automotive industry, and home electricians use them every day.

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Related Questions

  • Q:

    What does a voltmeter measure?

    A:

    A voltmeter measures the difference in voltage between two points on an electrical circuit. The two points are usually the positive and negative input terminals.  Both digital and analog voltmeters display their readings in terms of volts, which are units of measurement that convey  the force of electricity in a circuit.

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  • Q:

    Are voltmeters and ammeters both methods of measuring resistance?

    A:

    Neither a voltmeter nor an ammeter measures resistance directly; a voltmeter measures voltage and an ammeter measures amperage or current. However, using Ohm's law, resistance can be calculated from known quantities of voltage and current.

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  • Q:

    What is a common wire in an electrical circuit?

    A:

    A common wire is either a connecting wire or a type of neutral wiring, depending on the electrical circuit. When it works as a connecting wire, the wire connects at least two wires of a circuit together.

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  • Q:

    How does a battery work?

    A:

    According to the MIT School of Engineering, a battery provides an electrical charge due to the chemical reactions that take place inside it once it is connected into an electrical circuit. When a circuit connects the positive and negative poles, the anode and cathode inside the battery react with the electrolyte medium separating the two, producing a flow of electrons. This creates an electrical current and provides power.

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