Igcse Model Questions Vol1 2020 Physics Question 28
Practice objective / multiple choice question 28 from the 2020 Igcse Model Questions Vol1 Physics examination.
A battery of emf \(12\,\text{V}\) has an internal resistance \(r\). It is connected to an external circuit consisting of a resistor \(R_1 = 4\,\Omega\) in series with the parallel combination of \(R_2 = 6\,\Omega\) and \(R_3 = 8\,\Omega\). When the circuit is assembled, the terminal voltage across the external circuit is measured to be \(10\,\text{V}\).\ (a) Determine the internal resistance \(r\) of the battery (in ohms).\ (b) Keeping \(R_2\) and \(R_3\) unchanged, find the value of \(R_1\) that will maximise the power dissipated in \(R_1\). Give the optimum \(R_1\) (in ohms) and the corresponding maximum power (in watts).
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About This Question
This is Igcse Model Questions Vol1 2020 Physics Question 28. It is one of the objective questions from the 2020 Igcse Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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