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प्रश्न
How is the electric potential difference between the two points defined? State its S.I. unit.
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उत्तर
The potential difference between two points is equal to the work done in moving a unit positive charge from one point to the other.
It's S.I. unit is Volt.
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संबंधित प्रश्न
Which of the following statements correctly defines a volt?
(a) a volt is a joule per ampere.
(b) a volt is a joule per coulomb.
Potential difference is measured in _________ by using a ___________ placed in ___________ across a component.
How is a voltmeter connected in the circuit to measure the potential difference between two points? Explain with the help of a diagram.
Keeping the potential difference constant, the resistance of a circuit is halved. By how much does the current change?
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 |
The following table shows current in Amperes and potential difference in Volts.
Which law will the graph prove? Explain the law.
Three electric cells of potential difference 1.5 V each have been connected as a battery. The potential differences of the battery will be ____________ V.
A cell of e.m.f 2.0 V and internal resistance 1Ω is connected to the resistors of 3Ω and 6Ω in series. Calculate:
(i) the current drawn from the cell,
(ii) the p.d. across each resistor,
(iii) the terminal voltage of the cell and
(iv) the voltage drop.
Potential near a charge is the measure of its ______ to bring a positive charge at that point.
Conceptual question.
A bird sitting on a high power electric line is still safe. How?
