Gce Model Questions Vol1 2019 Physics Question 33

Practice objective / multiple choice question 33 from the 2019 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2019 Physics Objective / Multiple Choice Hard Difficulty
Question 33 GCE_MODEL_QUESTIONS_VOL1 • 2019 • PHYSICS • objective

A battery of unknown emf \(E\) and internal resistance \(r\) is connected to a \(12\ \Omega\) resistor. The current measured in the circuit is \(0.75\ \text{A}\) and the terminal voltage across the resistor is \(9\ \text{V}\). If the efficiency of the battery (the ratio of power delivered to the external resistor to the total power developed by the battery) is \(80\%\), determine the emf \(E\) and the internal resistance \(r\) of the battery, and state the total power developed by the battery.

Answer Options

A. E = 12.0 V, r = 2 Ω, total power ≈ 9.00 W
Correct Answer B. E = 11.25 V, r = 3 Ω, total power ≈ 8.44 W
C. E = 9.75 V, r = 5 Ω, total power ≈ 6.50 W
D. E = 10.5 V, r = 4 Ω, total power ≈ 7.88 W
Correct Answer
B
Correct Option:
E = 11.25 V, r = 3 Ω, total power ≈ 8.44 W

About This Question

This is Gce Model Questions Vol1 2019 Physics Question 33. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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