Year 8 Energy Formative

What type of energy transformation occurs, when a hawk eats a mouse and then uses the energy from the mouse to fly?

• mechanical energy to chemical energy

• thermal energy to mechanical energy

• chemical energy to mechanical energy

• mechanical energy to thermal energy

Which of the following energy transformations occur when a lamp that is plugged into a wall socket is functioning correctly?

• Chemical to light

• Electrical to chemical

• Electrical to light

• Chemical to electrical

Position ____ has the highest kinetic energy.

• W

• X

• Y

• Z

A television has a total power input of 150kJ. While switched on, 90 kJ of light energy, 22.5 kJ of sound energy, and 37.5 kJ of heat energy is produced.

Identify the wasted energy type.

A television has a total power input of 150kJ. While switched on, 90 kJ of light energy, 22.5 kJ of sound energy, and 37.5 kJ of heat energy is produced.

Calculate the energy efficiency of the television.

State the law of conservation of energy.

Explain the difference between an energy transfer and and energy transformation.

Which of these is an example of light energy being transformed into chemical energy?

• A glow stick lights up when broken.

• Water heated by the sun evaporates.

• A plant makes sugar in the sunlight.

• A battery causes a buzzer to vibrate.

When sound waves are absorbed by an object or surface, the sound energy is transformed to _______ energy.

The type of heat transfer when two objects are directly touching. (Example, hot pan to hand)

• Radiation

• Transformation

• Convection

• Conduction