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प्रश्न
Name a device that helps to maintain a potential difference across a conductor.
उत्तर
Any source of electricity like battery, cell, power supply, etc. helps to maintain a potential difference across a conductor.
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संबंधित प्रश्न
How much energy is given to each coulomb of charge passing through a 6 V battery?
Calculate the work done in moving a charge of 4 coulombs from a point at 220 volts to another point at 230 volts.
What is the potential difference between the terminals of a battery if 250 joules of work is required to transfer 20 coulombs of charge from one terminal of battery to the other?
The device used for measuring potential difference is known as:
Keeping the potential difference constant, the resistance of a circuit is doubled. By how much does the current change?
What is the ratio of potential difference and current known as?
The values of potential difference V applies across a resistor and the corresponding values of current I flowing in the resistor are given below:
| Potential differences, V (in volts) | : | 2.5 | 5.0 | 10.0 | 15.0 | 20.0 | 25.0 |
| Current, I (in amperes) | : | 0.1 | 0.2 | 0.4 | 0.6 | 0.8 | 1.0 |
Write down the formula which states the relation between potential difference, current, and resistance.
For the circuit shown in the diagram below:
What is the value of:
(i) current through 6 Ω resistor?
(ii) potential difference across 12 Ω resistor?
Explain the statement ‘the potential difference between two points is 1 volt’.
The voltage across a 3Ω resistance is 6 V. How large is the current? What is
the resistance of a filament lamp when a voltage of 3 V across it causes a
current of 0.5 A?
What would you suggest to a student if while performing an experiment he finds that the pointer/needle of the ammeter and voltmeter do not coincide with the zero marks on the scales when the circuit is open? No extra ammeter/voltmeter is available in the laboratory.
A V-I graph for a nichrome wire is given below. What do you infer from this graph? Draw a labelled circuit diagram to obtain such a graph.
What do you understand by the resistance of a wire?
An electric bulb draws 0.5 A current at 3.0 V. Calculate the resistance of the filament of the bulb.
Define electric potential and potential difference.
Electric potential is a ____________.
A cylindrical conductor of length l and uniform area of cross section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross section
The SI unit of potential difference is ______.
Electric potential is a measure of the ______ on the unit positive charge to bring it to that point against all electrical forces.
