Gce Model Questions Vol1 2017 Physics Question 12
Practice objective / multiple choice question 12 from the 2017 Gce Model Questions Vol1 Physics examination.
A battery has an unknown emf \(E\) and internal resistance \(r\). When a single lamp of resistance \(R\) is connected across its terminals, a current of \(2.0\ \text{A}\) flows and the terminal voltage is \(8.0\ \text{V}\). When a second identical lamp is connected in parallel with the first, the total current supplied by the battery becomes \(3.0\ \text{A}\). Determine (i) the emf \(E\) of the battery, (ii) the internal resistance \(r\), and (iii) the efficiency (useful power delivered to the two lamps divided by the total power output of the battery) for the parallel arrangement. Express the efficiency as a percentage.
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About This Question
This is Gce Model Questions Vol1 2017 Physics Question 12. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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