Energy Concepts Quiz

Which of the following is a form of potential or stored energy?

• Sound

• Chemical

• Light

• Heat

Which of the following is the best example of gravitational potential energy?

• A moving car

• A chair

• A bike at the top of a hill

• A stretched elastic band

Choose the best definition for the law of conservation of energy

• Energy cannot be created or destroyed, but it can be changed from one form to another

• Energy can be created or destroyed, through energy transformations

• Energy can be created when one type of energy changes to another

• Energy cannot be created or destroyed, because it can’t move from one object to another

In a bottle rocket, chemical energy is transformed into what type of energy?

• Kinetic

• Gravitational

• Heat

• Elastic

Describe the energy transformations that occur when a car uses petrol to move.

Describe your own example of an energy transformation.

Compare a closed system and an open system.

A light bulb has an energy input of 100 joules. The light bulb produces 40 joules of useful energy, and 60 joules are lost (wasted) as heat energy. Sketch a Sankey diagram to represent this information.

Calculate the percentage energy efficiency of the light bulb in question 8.

A certain light bulb is said to be highly efficient. Explain what this means.