Gce Model Questions Vol1 2025 Physics Question 32

Practice objective / multiple choice question 32 from the 2025 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2025 Physics Objective / Multiple Choice Hard Difficulty
Question 32 GCE_MODEL_QUESTIONS_VOL1 • 2025 • PHYSICS • objective

A 12 V battery has an internal resistance \(r\). It is connected to two external resistors, \(R_1 = 6\;\Omega\) and \(R_2 = 12\;\Omega\), which are placed in parallel across the terminals. The terminal voltage measured under this load is 9 V. (i) Determine the internal resistance \(r\). (ii) The same battery is then used to power a single external resistor \(R\) such that the power delivered to the resistor is maximised. Find the value of \(R\) that gives maximum power and calculate that maximum power.

Answer Options

Correct Answer A. r = 1.33 Ω; R = 1.33 Ω; maximum power = 27 W
B. r = 2 Ω; R = 2 Ω; maximum power = 18 W
C. r = 0.75 Ω; R = 0.75 Ω; maximum power = 48 W
D. r = 6 Ω; R = 6 Ω; maximum power = 6 W
Correct Answer
A
Correct Option:
r = 1.33 Ω; R = 1.33 Ω; maximum power = 27 W

About This Question

This is Gce Model Questions Vol1 2025 Physics Question 32. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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