![]() ![]() The amount by which the electromagnetic coil moves, called “deflection”, is proportional to the strength of current flowing through the coil needed to produce the magnetic field required to deflect the needle. Voltmeters can be used to measure the voltage drop across a single component or supply, or they can be used to measure the sum of voltage drops across two or more points or components within a circuit. To measure a voltage (potential difference), a voltmeter must be connected in parallel with the component whose voltage you wish to measure. Voltmeters can also be used to measure DC voltage as well as sinusoidal AC voltages but the introduction of a voltmeter as a measuring instrument into a circuit can interfere with its steady state conditions.Īs its names implies, a “Voltmeter” is an instrument used for measuring voltage (V), that is the potential difference present between any two points within a circuit. Voltmeters used for the measurement of voltage come in many shapes and sizes, either analogue or digital, or as part of a digital multimeter more commonly used today. ![]() When analysing the operation of electrical and electronic circuits, or trying to understand why a circuit does not work as expected, eventually you will need to use a Voltmeter to measure the various voltage levels. ![]()
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