Question

graph bw emf and internal resistance of a cell​

Answer 1

Answer:

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Explanation:

Emf and internal resistance

ε = IR + Ir. V = ε – Ir. So V = ε – Ir, where V is the potential difference across the circuit, ε is the emf, I is the current flowing through the circuit, r is internal resistance. Usually internal resistance of a cell is not considered because ε >> Ir.

What is the formula of EMF?

The emf is equal to the work done on the charge per unit charge (ϵ=dWdq) when there is no current flowing. Since the unit for work is the joule and the unit for charge is the coulomb, the unit for emf is the volt (1V=1J/C).