Question

when an electric current flows through a conductor, it becomes hot. why? list the factor in which the heat produced in a conductor depend. state joules law of heating. how will the heat produce in an elecric circuit be effected if the resistence in a circiut is doubled for the same current

Answer 1

When electricity moves through anything -- wires or bodily tissues -- there are actual electrons (typically) moving. These electrons are being pulled along by an electric field, but they're also bumping into the atoms that make up the wire or bodily tissue. When an electron bumps into an atom, it transfers some of its kinetic energy to that atom. Temperature is just a form of kinetic energy, where you subtract the "bulk motion". If the atoms in the wire or the bodily tissue aren't moving, this means that all of the kinetic energy that gets transferred to them is measured as temperature. That is, the atoms heat up. This process is called "Joule heating", and is the same principle for wires as for bodily tissue.
The resistance-change factor per degree Celsius of temperature change is called the temperature coefficient of resistance. This factor is represented by the Greek lower-case letter “alpha” (α). A positive coefficient for a material means that its resistance increases with an increase in temperature.

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Answer 2

When an electric current flows through a conductor, it becomes hot because,the resistance of the conductor blocks the electricity flow by making collision of free electrons with the atoms and impurities. This collision produces heat energy.

• The produced heat is dependent on the following things -

- Amount of the electricity flow.

- Time of the electricity flow.

- Resistance of the conductor.

• The Joules law of heating states that the amount of heat energy produced in a electrical conductor is directly proportional to the product of ; square of the current, resistance and time of flow.

• If the resistance becomes double then the produced heat will be doubled.

H = I²RT

2×H = I²× 2×R × T

2H = I²2RT