Question
Explain from where does the dissipated power in the resistor come form. 
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Write a short note on electric cell.

Answer

→Electric cell :
We need an external source to keep a steady current through the conductor.

Image
This external source supplies the required power. To explain this a, simple circuit with a cell is shown in the figure.
As shown in the figure, when external resistor is connected with a cell, the energy is dissipated in the form of heat across the resistor. This energy comes from the chemical energy of the cell.
As long as this cell supplies chemical energy to the circuit, the circuit receives power.

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