The terminals of a battery of emf 24.0 V and internal resistance of 1.0Ω is
PHYSICS
JAMB 2023
The terminals of a battery of emf 24.0 V and internal resistance of 1.0Ω is connected to an external resistor 5.0Ω. Find the terminal p.d.
- A. 18.0V
- B. 12.0V
- C. 16.0V
- D. 20.0V
Correct Answer: D. 20.0V
Explanation
ε =24.0 V, r=1Ω,R=5.0Ω
terminal p·d = ?
ε= IR+Ir = I(R+r)
⇒ IR+Ir = I(R+r)
⇒ I = \(\frac{24}{5+1}\)
⇒ I =\(\frac{24}{6}\)
⇒ I = 4 A
terminal p·d = 4 × 5
terminal p·d = 20.0 V
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