Neco Model Questions Vol1 2019 Physics Question 50

Practice objective / multiple choice question 50 from the 2019 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2019 Physics Objective / Multiple Choice Hard Difficulty
Question 50 NECO_MODEL_QUESTIONS_VOL1 • 2019 • PHYSICS • objective

A 12 V battery has an internal resistance of \(0.5\ \Omega\). It is connected to an external circuit consisting of a resistor \(R_{1}=4\ \Omega\) in series with a parallel network of \(R_{2}=6\ \Omega\) and \(R_{3}=12\ \Omega\). (a) Find the terminal voltage across the external circuit. (b) Calculate the total power supplied by the battery. (c) Determine the efficiency of the circuit, defined as the ratio of the power dissipated in the external resistors to the total power supplied by the battery. (d) If an additional resistor \(R_{4}=8\ \Omega\) is added in parallel with the existing parallel network, what is the new efficiency of the circuit?

Answer Options

A. V_term ≈ 10.8 V; P_total ≈ 15.2 W; efficiency ≈ 90 %; with R4 added efficiency ≈ 89 %.
B. V_term ≈ 12.0 V; P_total ≈ 20.0 W; efficiency ≈ 98 %; with R4 added efficiency ≈ 97 %.
C. V_term ≈ 11.7 V; P_total ≈ 18.3 W; efficiency ≈ 96 %; with R4 added efficiency ≈ 95 %.
Correct Answer D. V_term ≈ 11.3 V; P_total ≈ 16.9 W; efficiency ≈ 94 %; with R4 added efficiency ≈ 93 %.
Correct Answer
D
Correct Option:
V_term ≈ 11.3 V; P_total ≈ 16.9 W; efficiency ≈ 94 %; with R4 added efficiency ≈ 93 %.

About This Question

This is Neco Model Questions Vol1 2019 Physics Question 50. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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