An electric source has an emf of 130 V and a terminal voltage of 110 V. If it supplies a terminal current of 20 A, its internal resistance will be
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 1 Ω
$E = 130,\; V = 110,\; I = 20$
$E = V + Ir$
$130 = 110 + 20r$
$20 = 20r$
$r = 1$
Final Answer: $1\ \Omega$