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Which instrument is used to measure electric current?
A. Voltmeter
B. Ammeter
C. Barometer
D. Thermometer
Correct Answer Is Option = Ammeter
Notes / Explanation
The instrument that is used to measure electric current is called an ammeter, and it is one of the basic instruments used in the study of electricity and in electrical work. Electric current is the flow of electric charge through a conductor such as a wire, and it is one of the most important quantities in the study of electricity, being a measure of how much electricity is flowing through a circuit. In order to measure the amount of electric current flowing in a circuit, the instrument called the ammeter is used, and its name is derived from the unit in which electric current is measured, which is the ampere. The ammeter is connected into the circuit in such a way that the current to be measured flows through it, and it then indicates the value of the current, either by the movement of a pointer over a scale in older types or by a numerical display in modern electronic types. It is important that the ammeter is connected into the circuit in the correct manner, in line with the flow of the current, so that the current passes through the instrument, and the ammeter is designed so that it can be connected in this way without significantly affecting the current that it is measuring. The ammeter should be distinguished from another important electrical instrument, the voltmeter, which is used to measure a different electrical quantity, namely the electrical pressure or force that drives the current, known as the voltage, and which is connected into a circuit in a different way. The ammeter and the voltmeter are both essential tools for anyone working with electricity, for testing circuits, for checking that equipment is working properly, and for measuring and understanding the behaviour of electrical circuits. In modern practice, instruments are often available that can measure current, voltage and other quantities all in one device. The measurement of electric current and other electrical quantities is fundamental to the study and use of electricity. For PPSC and other competitive examinations, the key points to remember are that the instrument used to measure electric current is the ammeter, that electric current is the flow of electric charge and is measured in amperes, that the ammeter is connected into the circuit so that the current flows through it, and that it should be distinguished from the voltmeter, which measures voltage.
