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प्रश्न
Name a device which helps to maintain potential difference across a conductor (say, a bulb).
उत्तर
A cell or a battery helps to maintain potential difference across a conductor.
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संबंधित प्रश्न
The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are as given below:
| V (volts) | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 4.0 | 5.0 |
| I (amperes) | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.8 | 1.0 |
Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor.
State whether a voltmeter has a high resistance of a low resistance. Give reason for your answer.
The p.d. across a lamp is 12 V. How many joules of electrical energy are changed into heat and light when:
a charge of 1 C passes through it?
Keeping the potential difference constant, the resistance of a circuit is halved. By how much does the current change?
Explain the analogy between the flow of charge (or current) in a conductor under a potential difference with the free fall of a body under gravity.
Suppose there are three resistors A, B, and C having resistances r1, r2, and r3 respectively. If R represents their equivalent resistance, establish the following relation R = r1 + r2 + r3 when joined in series.
Conceptual question.
A bird sitting on a high power electric line is still safe. How?
If P and V are the power and potential of device, the power consumed with a supply potential V1 is:
What does the positive and negative sign of potential convey?
