Waec Model Questions Vol1 2021 Physics Question 29
Practice objective / multiple choice question 29 from the 2021 Waec Model Questions Vol1 Physics examination.
A 12 V ideal battery has an internal resistance r. It supplies an external circuit consisting of a 2 Ω resistor (R₁) in series with the parallel combination of a 6 Ω resistor (R₂) and a 12 Ω resistor (R₃). The total current drawn from the battery is 1.5 A. (a) Determine the internal resistance r. (b) The same battery now powers a Wheatstone bridge where R₁ and R₂ form one pair of opposite arms and R₃ and a variable resistor Rₓ form the other pair. Find the value of Rₓ that balances the bridge. (c) Compute the efficiency of the original circuit (ratio of power delivered to the external resistors to the total power supplied by the battery).
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About This Question
This is Waec Model Questions Vol1 2021 Physics Question 29. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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