zioncollins

Where does most of the energy go in this transformation.

• Electrical energy
• Light
• Heat
• other

Where does most of the energy go for this transformation.

• heat
• electrical
• light
• joules

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%

The law of energy conservation says the total energy before the change _______ the total energy after it

• is less than
• is more than
• affects
• equals

What is an energy transfer?

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

In energy transformations, "wasted energy" usually takes what form?

• heat
• chemical energy
• light
• sound waves

A (a)   diagram shows the energy transfers in a system.