Gce Model Questions Vol1 2022 Physics Question 8

Practice objective / multiple choice question 8 from the 2022 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2022 Physics Objective / Multiple Choice Hard Difficulty
Question 8 GCE_MODEL_QUESTIONS_VOL1 • 2022 • PHYSICS • objective

A battery of emf \(E\) V and internal resistance \(r\) Ω supplies a resistor of \(10\,\Omega\) and a current of \(2.0\,\text{A}\) flows. When the external resistor is changed to \(20\,\Omega\) the current becomes \(1.5\,\text{A}\). (a) Determine the emf \(E\) and the internal resistance \(r\). (b) If a load resistor of \(15\,\Omega\) is now connected, calculate the efficiency of the circuit (useful power delivered to the load divided by the total power supplied by the battery) and give the terminal voltage across the load.

Answer Options

A. E = 55 V; r = 25 Ω; efficiency ≈ 38 %; terminal voltage ≈ 23.1 V
Correct Answer B. E = 60 V; r = 20 Ω; efficiency ≈ 43 %; terminal voltage ≈ 25.7 V
C. E = 60 V; r = 30 Ω; efficiency ≈ 35 %; terminal voltage ≈ 22.0 V
D. E = 70 V; r = 15 Ω; efficiency ≈ 50 %; terminal voltage ≈ 28.5 V
Correct Answer
B
Correct Option:
E = 60 V; r = 20 Ω; efficiency ≈ 43 %; terminal voltage ≈ 25.7 V

About This Question

This is Gce Model Questions Vol1 2022 Physics Question 8. It is one of the objective questions from the 2022 Gce Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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