Igcse Model Questions Vol1 2021 Physics Question 23
Practice objective / multiple choice question 23 from the 2021 Igcse Model Questions Vol1 Physics examination.
A battery of emf \(E\) V and internal resistance \(0.5\ \Omega\) supplies two appliances that are connected in parallel: a heater and a motor. The heater draws a current of \(5\ \text{A}\) and the motor draws \(2\ \text{A}\). The terminal voltage across the appliances is measured to be \(12\ \text{V}\).\n\n(a) Determine the emf \(E\) of the battery (in volts).\n\n(b) Find the resistance of the heater (in \(\Omega\)).\n\n(c) Calculate the efficiency of the battery, defined as the ratio of the total power delivered to the appliances to the total power developed by the battery (express your answer as a percentage to one decimal place).
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This is Igcse Model Questions Vol1 2021 Physics Question 23. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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