A rechargeable battery powers a motor that lifts a load at constant speed. The battery, motor, load, Earth and surrounding air form a closed system. Which combination correctly describes this process?
Mechanical transfer to motor; electrical transfer to load; total energy unchanged
Mechanical transfer to motor; electrical transfer to load; total energy decreases
Electrical transfer to motor; mechanical transfer to load; total energy unchanged
Electrical transfer to motor; mechanical transfer to load; total energy decreases
115 exam-style questions on Edexcel GCSE Physics 8.1 Energy transfers and work, covering 8.1.1 Energy stores and transfer diagrams, 8.1.2 Ways of changing a system's energy, and 8.1.3 Work done by forces. Each one has a worked solution and a mark scheme showing where the marks go.