Neco Model Questions Vol1 2022 Physics Question 19

Practice objective / multiple choice question 19 from the 2022 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2022 Physics Objective / Multiple Choice Hard Difficulty
Question 19 NECO_MODEL_QUESTIONS_VOL1 • 2022 • PHYSICS • objective

A battery of emf \(12\ \text{V}\) has an internal resistance \(r\). When a load resistor of \(6\ \Omega\) is connected, the terminal voltage across the load is measured to be \(9\ \text{V}\). (a) Determine the internal resistance \(r\). (b) Find the maximum power that can be delivered to a load, and the value of the load resistance for which this occurs. (c) Calculate the efficiency of the circuit when it is delivering this maximum power.

Answer Options

A. r = 1 Ω, maximum power = 24 W, efficiency = 50 %
Correct Answer B. r = 2 Ω, maximum power = 18 W, efficiency = 50 %
C. r = 4 Ω, maximum power = 9 W, efficiency = 50 %
D. r = 3 Ω, maximum power = 12 W, efficiency = 50 %
Correct Answer
B
Correct Option:
r = 2 Ω, maximum power = 18 W, efficiency = 50 %

About This Question

This is Neco Model Questions Vol1 2022 Physics Question 19. It is one of the objective questions from the 2022 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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