Question

State Ohms law. What is meant by electrical resistance of a conductor? State how resistance of a conductor is affected when i) a low current passes through it for a short duration ii) a heavy current passes through it for about 30 s.

Answer 1

Answer:

ohm law means the current us ditectly propostional to potenial difference

V= IR

Answer 2

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♡ Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

♡ Resistance is defined as the property of a conductor to resist the flow of charges through it. The resistance of conductor is numerically given as the ratio of potential difference across its length to the current flowing through it.

a) When a low current is passed for a long time, due to the heat effect of current, the temperature of the conductor will increase. Resistance is directly proportional to temperature. Thus, resistance will increase.

b) The obstruction offered, by the positive ions present in a conductor, to the flow of current through a conductor is known as RESISTANCE. a) When a low current is passed for a long time, due to the heat effect of current, the temperature of the conductor will increase. Resistance is directly proportional to temperature.

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