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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 will be the change in the current if the potential difference is kept constant and the resistance of the circuit is made four times?
- It will remain unchanged.
- It will become four times.
- It will become one-fourth.
- It will become half.
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- Which law is illustrated by such a graph?
- What should remain constant in a statement of this law?
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?
Choose the correct alternative.
Which of the following is an ohmic conductor?
Two cells of same emf E but internal resistance r1 and r2 are connected in series to an external resistor R (Figure). What should be the value of R so that the potential difference across the terminals of the first cell becomes zero.
Let the resistance of an electrical device remain constant, while the potential difference across its two ends decreases to one fourth of its initial value. What change will occur in the current through it? State the law which helps us in solving the above stated question.
When two conductors at different electric potentials are joined by a metallic wire, in which direction do the electrons flow?
If the voltage across a conductor is increased while its temperature remains unchanged, what happens to the current flowing through it?
