Efficiency

Where does most of the energy go in this transformation.

• Electrical energy
• Light
• Heat
• other

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

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

• 5%

• 50%

• 55%

• 100%

Tags

NGSS.MS-PS3-5

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

• heat
• chemical energy
• light
• Electrical

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

• 100%

• 80%

• 40%

• 10%

Tags

NGSS.MS-PS3-3

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%

What type of device might this Sankey be about?

• A very efficient LED light bulb
• A very inefficient incandescent light bulb
• A coal power plant
• A wind turbine

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

NGSS.HS-PS3-4

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

• 5%

• 50%

• 55%

• 100%

Tags

NGSS.MS-PS3-5

No machine in existence has 100% efficiency due to ____________________.

• magic
• friction
• smoke
• input

Calculate the useful energy output for a light bulb when total energy input is 3000 J and it has an efficiency of 32%.

Tags

NGSS.HS-PS3-1

Calculate the useful energy output for a toaster when total energy input is 51230J and it has an efficiency of 60%.

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4