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प्रश्न
State and define Ohm’s law.
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उत्तर
Ohm’s law states that at a constant temperature, the current flowing in a conductor is directly proportional to the potential difference across its ends, i.e., if the potential difference is halved, the current is also halved and if p.d. is doubled, the current is also doubled, i.e.,
V (potential difference) ∝ i (current)
Or V = iR, where R is constant, called the resistance of the conductor.
So V = iR represents Ohm’s law.
संबंधित प्रश्न
Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?
What is an ohmic resistor? Give one example of an ohmic resistor. Draw a graph to show its current voltage relationship. How is the resistance of the resistor determined from this graph?
Define ampere and volt with respect to Ohm’s law.
Answer the following question.
Distinguish between Ohmic and non-ohmic substances; explain with the help of example.
State Ohm’s law? How can it be verified experimentally? Does it hold good under all conditions? Comment.
The voltage - current readings of a certain material are shown in the table given below:
| Voltage (V) | 10 V | 20 V | 30 V |
| Current (I) | 2 A | 3 A | 4 A |
Study the table.
- State whether the conductor used is ohmic or non-ohmic.
- Justify your answer.
- State Ohm's law.
Which of the following correctly defines Potential Difference (V) as one of the three core quantities of Ohm's Law?
Resistance (R) in a conductor is best described as:
When two conductors at different electric potentials are joined by a metallic wire, in which direction do the electrons flow?
What is the nature of the graph obtained when potential difference is plotted against current for an Ohmic conductor?
