Mechanical to Electrical Energy Practice exercise 1

How does pedaling a bicycle with a dynamo light demonstrate transformation of energy? (1 mark)

Study the diagram of a hand crank generator below and answer the question that follows. What happens when the crank handle is turned? (1 mark)

In some areas of Kenya, bicycles are used to charge mobile phones. Explain the energy transformation that occurs in such a setup. (1 mark)

What form of energy turns the blades of a hydroelectric turbine? (1 mark)

What type of energy transformation occurs in a wind turbine? (1 mark)

Study the diagram below of a small wind turbine used to charge a battery and answer the question that follows. What energy transformation occurs when the blades spin, and why must the blades be properly maintained for efficiency? (2 marks)

Study the diagram below of a small wind turbine used to charge a battery and answer the question that follows. What energy transformation occurs when the blades spin, and why must the blades be properly maintained for efficiency? (2 marks)

Study the diagram below of a small wind turbine used to charge a battery and answer the question that follows. What energy transformation occurs when the blades spin, and why must the blades be properly maintained for efficiency? (2 marks)

A learner's hand-cranked radio stopped working after several uses. When the crank is turned, no sound is heard. What could be the reason related to energy transformation, and how can it be fixed? (2 marks)

A pupil connects a dynamo to their bicycle to light a bulb. When pedaling slowly, the bulb glows dimly. What can they do to make the bulb brighter, based on energy transformation? (1 mark)

A school in Kajiado uses a wind-powered water pump. During calm days with no wind, the pump fails to operate. Explain why the pump fails and suggest a suitable alternative energy transformation that could work in this situation. (2 marks)

A school in Kajiado uses a wind-powered water pump. During calm days with no wind, the pump fails to operate. Explain why the pump fails and suggest a suitable alternative energy transformation that could work in this situation. (2 marks)

Mary and Chax were arguing about the energy transformation in the small windmill at their school. Mary said the windmill changes wind energy directly into electricity. Chax said the windmill first changes wind energy into movement, and then the movement is changed into electricity. Who is correct? Explain your answer. (2 marks)

Mary and Chax were arguing about the energy transformation in the small windmill at their school. Mary said the windmill changes wind energy directly into electricity. Chax said the windmill first changes wind energy into movement, and then the movement is changed into electricity. Who is correct? Explain your answer. (2 marks)