Correct Answer: Option A

Explanation

E = 2V, r = 0.5Ω, I = 0.4A, P = ?

 E = I( R + r )

R = \(\frac{ E}{I} - r \)

R =  \(\frac{ 2}{0.4} - 0.5\)

R = 5 - 0.5 = 4.5Ω

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