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Q1 Sometimes it is said that "heat is developed in" in a resistance when there is electric current in it. Recall heat is defined as energy due to temperature difference. Is the statement under quotes technically correct? Q2 When a current is estabished in a wire, the free electrons drift in the direction opposite to the current. Does the number of free electrons in a wire continuously decrease?
Q1 Sometimes it is said that "heat is developed in" in a resistance when there is electric current in it. Recall heat is defined as energy due to temperature difference. Is the statement under quotes technically correct?
Q2 When a current is estabished in a wire, the free electrons drift in the direction opposite to the current. Does the number of free electrons in a wire continuously decrease?
Dear nikhil,
When a charge moves in a conductor, work is done by that charge. Devices can be made which convert this work into heat ( electric heaters), light (light bulbs and neon tubes), or motion, i.e. kinetic energy (power tools).
From the definition of potential difference, V, we have V = W/Q, where W is the work done by charge Q. Hence, W = VQ.
Current is the flow of charge, so that in time t, the amount of charge moving through the conductor will be Q = It.
Therefore, W = VIt gives the work done in time t, by a current I, flowing through a conductor across which the potential difference is V. This may be written in two other ways by substituting from Ohm's Law:
where R is the resistance of the conductor.
We are all IITians and here to help you in your IIT JEE preparation. All the best. If you like this answer please approve it.... win exciting gifts by answering the questions on Discussion Forum Sagar Singh B.Tech IIT Delhi sagarsingh24.iitd@gmail.com
We are all IITians and here to help you in your IIT JEE preparation. All the best.
If you like this answer please approve it....
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Sagar Singh
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sagarsingh24.iitd@gmail.com
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