What Is a Voltmeter?
The basic law that governs electric circuits is Ohm's Law. The Ohm's Law states that the ratio of voltage to the current is a constant. The constant referred to is the resistance of the circuit. The voltmeter and ammeter are tools utilized to show the application of Ohm's Law in terms of voltage and current. Does this Spark an idea?
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Definition
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The voltmeter is an electrical instrument that measures the potential difference or voltage between two points in the circuit. The unit volt (V) was named after Allesandro Volta (1945-1827).
Application
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A voltmeter is connected in parallel to any electrical instrument or always across the resistor, if the measurement involves a resistor. Like an ammeter, most voltmeters have three scales corresponding to specific volt ranges.
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Upper Scale Voltmeter
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The upper scale measures volts ranging from 0.5 to 30 volts (V).The least reading in an upper scale is 0.5 volts since one volt is divided into two parts.
Middle Scale Voltmeter
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The middle scale measures volts ranging from 0V to 3V.
Lower Scale Voltmeter
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The lower scale measures volts ranging from 0V to 1.5V.
How Scale Voltmeter Works?
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To determine which scale of voltmeter one has to use, an approximation of how much current will pass through the wire should be made. Then select the scale or knob corresponding to it and set up the parallel connection.
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References
- A. Findlay, Voltaic Cells, January 2005
