The terminals of a battery of emf 24.0 V and internal resistance of 1.0 Ω is connected to an external resistor 5.0 Ω. Find the terminal p.d.

The terminals of a battery of emf 24.0 V and internal resistance of 1.0 Ω is connected to an external resistor 5.0 Ω. Find the terminal p.d.
A. 18.0V
B. 12.0V
C. 16.0V
D. 20.0V

Correct Option: Answer is D
ε = 24.0 V, r=1Ω, R=5.0Ω
terminal p·d = ?

ε = IR+Ir = I(R+r)

⇒ IR+Ir = I(R+r)

⇒ I = 245+1245+1

⇒ I =246246

⇒ I = 4 A

terminal p·d = 4 × 5

terminal p·d = 20.0 V

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