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प्रश्न
State Ohm's Law. Represent it mathematically.
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उत्तर
According to Ohm's law, "Electric current through a metallic conductor is directly proportional to potential difference across the conductor of the circuit provided that temperature remains constant."
Mathematical expression for Ohm's Law: I ∝ V.
Or V = IR
Or I = `"V"/"R"`
Where, R = constant called resistance of a given metal.
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संबंधित प्रश्न
What is the necessary condition for a conductor to obey Ohm’s law?
- Draw a V-I graph for a conductor obeying Ohm’s law.
- What does the slope of V–I graph for a conductor represent?
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 the following:
Coulomb
Define ampere and volt with respect to Ohm’s law.
State the limitations of Ohm’s law.
SI unit of resistance is:
Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1 mm. Conductor B is a hollow tube of outer diameter 2 mm and inner diameter 1 mm. Find the ratio of resistance RA to RB.
How is electric current related to the potential difference across the terminals of a conductor?
Draw a labelled circuit diagram to verify this relationship.
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.
