A-LevelPhysicsWork, energy and power9702/12 · Feb/Mar 2024 · Q191 Mark

The battery of a small tablet computer is initially uncharged. It is connected to a constant 10W power supply for 2.0 hours to charge the battery. The efficiency of the charging process is 80%. What is the total energy stored in the battery?

A1.6 × 10¹ J

B1.6 × 10³ J

C5.8 × 10⁴ J

D5.8 × 10⁶ J

✓ Correct answer

C: 5.8 × 10⁴ J

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Topic: Work, energy and power, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2024 Paper 1 Variant 2, question 19.

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