# Working of Ammeter and Voltmeter?

It is important to be able to measure the current and voltage levels of an operating electrical system to check its operation, isolating malfunctions, and investigate effects impossible to predict on paper. As the names tell, An Ammeter is a device used to measure current levels, and the Voltmeter is the device used to find potential difference between two points. If the current levels are usually of the order of milliamperes, the instrument will typically be referred to as a milliammeter, and if the current levels are in the microampere range, as a microammeter. Similar statements can be made for voltage levels. Throughout the industry, voltage levels are measured more frequently than current levels, primarily because the measurement of the former does not require that the network connections be disturbed.

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Voltmeters are always hooked up across the element for which the voltage is to be determined.

The potential difference between two points can be measured by simply connecting the leads of the meter across the two points, as indicated in above figure. An up-scale reading is obtained by placing the positive lead of the meter to the point of higher potential of the network and the common or negative lead to the point of lower potential. The reverse connection will result in a negative reading or a below-zero indication.

Ammeters are placed in series with the branch in which the current is to be measured.

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Ammeters are connected in series, Since ammeters measure the rate of flow of charge, the meter must be placed in the network such that the charge will flow through the meter. The only way this can be accomplished is to open the path in which the current is to be measured and place the meter between the two resulting terminals. For the configuration of the voltage, source lead must be disconnected from the system and the Ammeter inserted as shown. An up-scale reading will be obtained if the polarities on the terminals of the Ammeter are such that the current of the system enters the positive terminal.

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## 1 Comment

1. #### JOHN MULINDI

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