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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
If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.
- 0.2 A
- 0.5 A
- 2 A
- 5 A
Rewrite the following statement by selecting the correct option.
The S.I. unit of resistance is __________.
What is non ohmic device?
Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.
Which of the following is correct for V-I graph of a good conductor?
The unit of specific resistance is ____________.
The variable resistance is called ____________.
Calculate the total resistance of the circuit and find the total current in the circuit.
Ohm's law deals with the relationship between ______
The circuit depicted in the figure is employed for studying Ohm’s Law. Instead of using a standard resistor, a student opts for a glass tube filled with mercury (tube 1), connected to the circuit through two electrodes, E1 and E2. He records the readings of the ammeter and voltmeter, thereby calculating the resistance. The student repeats the experiment by substituting tube 1 with tube 2, where the same amount of mercury fills tube 2.
Neglecting internal resistance of the cell use (> or < or =) to compare:
- the resistance in both the cases.
- the voltmeter readings in both the cases.
- the specific resistance in both the cases.
