Year 9 Energy part 1

What energy store involves moving objects?

• thermal

• chemical

• kinetic

• elastic

What energy store involves objects from a height?

• GPE

• chemical

• kinetic

• elastic

What energy store could involve springs?

• GPE

• chemical

• kinetic

• elastic

What is they type of energy that we want called?

• wasteful energy

• useful energy

• total energy

• input energy

What are the useful energy transfers that occur in a light bulb?

• light

• heat

• sound

• electrical

What are the wasteful energy transfers that occur in a light bulb?

• light

• heat

• sound

• electrical

What are the useful energy transfers in a hairdryer?

• sound

• kinetic

• thermal

• GPE

What are the wasteful energy transfers in a hairdryer?

• sound

• kinetic

• thermal

• GPE

What are the energy transfers that occur if a book fell of a shelf?

• GPE to kinetic

• GPE to chemical

• GPE to elastic

• GPE to thermal

An electric kettle uses 500kJ of electrical energy and transfers 400kJ of energy to the water in the kettle. What is the efficiency?

• 0.8%

• 80%

• 20%

• 0.2%