Q.

Potential difference is measured by.


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a

Ammeter

b

Voltmeter

c

Lactometer

d

Dry cell 

answer is B.

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Detailed Solution

Concept: The quantity of current multiplied by the resistance equals the potential difference, which is the same as voltage. One Coulomb of charge uses one Joule of energy to move between two locations in a circuit, which is equal to a potential difference of one Volt.
A voltmeter is used to measure the potential difference between two points. A voltmeter is connected in parallel across the electrical appliance about which we need to measure the potential difference.
Hence, the correct option is 2.
 
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