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Common Measuring Instruments - (Concept)

The electric current in a circuit is measured by an instrument called the ammeter, and the potential difference between two points in it is measured by a voltmeter. For example, in voltage stabilizers, a needle moving over a graduated scale gives the value of the measured quantity.

Ammeter                                    

                Voltmeter 

 

  1. How can we measure current using an ammeter?

To measure the current through an element of a circuit, an ammeter is connected in series with the element so that the current flowing through it also flows through the element. The reading of the ammeter gives the current through the lamp.

Note:- An ammeter is always connected in series in a circuit.

  1. How can we measure voltage using a voltmeter?

To measure the voltage across an element, a voltmeter is connected in parallel with that element so that whatever is the potential difference across that element also develops across the voltmeter. 

Note:- A voltmeter is always connected in parallel in a circuit.

Exam Chapter
JEE FOUNDATION Electricity
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