Grade 12Modern Physics
Could you explain about what are Cells emf and internal resistance please?
Could you explain about what are Cells emf and internal resistance please?
1 Answer
Arun
EMF is Electromotive Force, which is measured in coulombs of charge. It is pressure developed or an electric intensity from a electrical energy or a source. It is a device which converts any form of energy into electrical energy which is then measured with coulombs of charge.
Internal Resistance
When there is current present in the device or the electrical circuit and there’s a voltage drop in source voltage or source battery is internal resistance. It is caused due to electrolytic material in batteries or other voltage sources.
Internal Resistance (r) = (E – V)/I
Where E is the emf of the device; V is the potential difference between the device; I is the current in the device. Internal Resistance is the result of the resistance in the battery or the accumulation in the battery. the equation used to derive this is as follows:
V = (E – Ir)
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