Year 9 physics

The Law of Conservation of Energy states:

• Energy can created or destroyed but not transformed

• Energy cannot be created or destroyed, it can only transformed

• Energy can't be created, destroyed or transformed

• Energy cannot be created or destroyed.

What kind of energy does an object possess when it's resting on top of the hill?

• Potential Energy

• Chemical Energy

• Kinetic Energy

• All of the above

A kettle uses 100J of electrical energy to produce 7J of sound energy and 93J of thermal energy. How efficient is the kettle?

• 100%

• 7%

• 93%

• 95%

A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?

• 5%

• 50%

• 55%

• 100%

• 100%

• 80%

• 40%

• 10%

An iPhone charger coverts 75J of electricty in to 50J of charge and 25J of thermal energy. How efficient is the charger?

• 10%

• 100%

• 33%

• 67%

What is an energy transfer?

• Dancing 
• Movement of energy
• Movement of energy from one store to another
• something moving

Where does most of the energy go for this transformation.

• heat
• electrical
• light
• joules

What is this diagram called?

• Stankey Diagram

• Sankey Diagram

• Sankay Diagram

• Samkay Diagram

A battery converts what type of energy to another?

• sound to kinetic
• light to heat
• mechanical to electrical
• chemical to electrical