Neco 2021 Physics Question 15

Practice objective / multiple choice question 15 from the 2021 Neco Physics examination.

Neco 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 15 NECO • 2021 • PHYSICS • objective

A battery of emf \(E\) V and internal resistance \(r\) \(\Omega\) is connected to a parallel combination of a 4\,\Omega resistor and a 6\,\Omega resistor. The terminal voltage across the parallel network is 12\,V and the total current supplied by the battery is 5\,A. The total electrical power developed by the battery is 150\,W. Determine the emf \(E\) of the battery, its internal resistance \(r\), and the efficiency of the circuit (percentage of the power delivered to the external resistors).

Answer Options

Correct Answer A. E = 30 V, r = 3.6 Ω, efficiency = 40%
B. E = 32 V, r = 3.2 Ω, efficiency = 42%
C. E = 30 V, r = 4.5 Ω, efficiency = 35%
D. E = 28 V, r = 4.0 Ω, efficiency = 38%
Correct Answer
A
Correct Option:
E = 30 V, r = 3.6 Ω, efficiency = 40%

About This Question

This is Neco 2021 Physics Question 15. It is one of the objective questions from the 2021 Neco Physics examination.

Difficulty level: Hard .

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