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
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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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