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प्रश्न
The ratio of the potential difference to the current is known as ________.
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उत्तर
The ratio of the potential difference to the current is known as Ohm’s law.
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संबंधित प्रश्न
Find the expression for the resistivity of a material and state the SI unit of resistivity.
The graph between V and I for a conductor is a straight line passing through the origin.
Which law is illustrated by such a graph?
The resistors R1, R2, R3 and R4 in the figure given below are all equal in value.
What would you expect the voltmeter A, B and C to read assuming that the connecting wires in the circuit have negligible resistance?
In an experiment of verification of Ohm’s law following observations are obtained.
|
Potential difference V (in volt) |
0.5 | 1.0 | 1.5 | 2.0 | 2.5 |
| current I (in ampere) | 0.2 | 0.4 | 0.6 | 0.8 | 1.0 |
Draw a V-I graph and use this graph to find:
- the potential difference V when the current I is 0.5 A,
- the current I when the potential difference V is 0.75 V,
- the resistance in a circuit.
Fig. represents the circuit used for the verification of Ohm's law. Label the parts from A to F. state the function of each.
Rewrite the following statement by selecting the correct option.
The S.I. unit of resistance is __________.
Define ampere and volt with respect to Ohm’s law.
Write a short note on superconductors?
The resistance of a resistor is reduced to half of its initial value. If other parameters of the electrical circuit remain unaltered, the amount of heat produced in the resistor will become ______.
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.
