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प्रश्न
What is a voltmeter?
उत्तर
A voltmeter is an instrument that is used to measure the potential difference across a conductor.
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संबंधित प्रश्न
You have three resistors of values 2Ω, 3Ω and 5Ω. How will you join them so that the total resistance is more than 7Ω?
1) Draw a diagram for the arrangement
2) Calculate the equivalent resistance.
What do you understand by the term "electric potential"? (or potential) at a point? What is the unit of electric potential?
How is a voltmeter connected in the circuit to measure the potential difference between two points? Explain with the help of a diagram.
Calculate the power used in the 2 Ω resistor in each of the following circuits: a 4 V battery in parallel with 12 Ω and 2 Ω resistors.
100 joules of heat is produced per second in a 4 ohm resistor. What is the potential difference across the resistor?
Electric cells having 2V potential difference each have been connected in the form of a battery. What will be the total potential difference of the battery in both cases?
A 10 m long wire of a particular material is of resistance 5Ω What will be the resistance if the wire is stretched to double its length?
State Ohm’s law.
Name a device that helps to maintain a potential difference across conductors.
Twenty-seven drops of the same size are charged at 220 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.
