Waec Model Questions Vol1 2021 Physics Question 21

Practice objective / multiple choice question 21 from the 2021 Waec Model Questions Vol1 Physics examination.

Waec Model Questions Vol1 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 21 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A battery of unknown emf E and internal resistance r is connected to a load resistor. When a 10 Ω resistor is connected, the terminal voltage is 6 V. When a 20 Ω resistor is connected, the terminal voltage is 8 V. Determine (i) the emf and internal resistance of the battery, (ii) the value of external resistance that will make the power delivered to the load maximum, and (iii) the maximum power transferred to the load.

Answer Options

Correct Answer A. E = 12 V; r = 10 Ω; R = 10 Ω; Pmax = 3.6 W
B. E = 10 V; r = 12 Ω; R = 12 Ω; Pmax = 2.5 W
C. E = 14 V; r = 8 Ω; R = 8 Ω; Pmax = 4.9 W
D. E = 12 V; r = 8 Ω; R = 8 Ω; Pmax = 4.8 W
Correct Answer
A
Correct Option:
E = 12 V; r = 10 Ω; R = 10 Ω; Pmax = 3.6 W

About This Question

This is Waec Model Questions Vol1 2021 Physics Question 21. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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