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Cell and Emf of a cell is considered one of the most asked concept.
4 Questions around this concept.
In the circuit shown, current (in A) through the 50 V and 30 V batteries are, respectively :
Cell
The device which converts Chemical energy into electrical energy is known as an electric cell.
It maintains the flow of charge inside the circuit by supplying energy.
The direction of flow of current:
inside the cell is from negative to positive electrode
while outside the cell is from positive to negative electrode.
Electromotive force (Emf) of a cell:
It is the work done / energy carried by unit charge passing through one complete cycle of the circuit.
E=W/q
unit of emf is volt.
The emf of cell is also known as potential difference across the terminals of a cell when it is not giving any current.
Note-Cell is a source of constant emf but not constant current.
Potential difference (V)- It is the work done / energy carried by unit charge passing through external part (excluding the cell ) of the circuit.
Potential difference is equal to the product of current and resistance of that given part.
i.e.
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