Energy​ (a)   is how much of the energy is actually used, while energy ​ (b)   is using less energy.

• efficiency
• conservation
• wastefulness
• expenditure
• surplus

If 19 out of 100 gallons of gas is actually used to run the vehicle and the other 81 gallons is wasted, then gasoline is ___ efficient.

• 20% efficient
• 50% efficient
• 10% efficient
• 19% efficient

Answer explanation

Divide the part (19) by the whole (100) and multiply by 100 to get the percentage. So 19/100*100 = 19%

No device is ever 100% efficient because some energy is always lost as _____.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

What is cogeneration? Give one example.

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS3-3

When is the peak time of the day for energy usage?

• 12 PM to 2 PM
• 10 PM to 12 AM
• 3 PM to 7 PM

• 8 AM to 10 AM

How does cooking outdoors help conserve energy?

Tags

NGSS.MS-PS3-3

List 3 ways homes/buildings can be more energy efficient.

Tags

NGSS.MS-ETS1-2

NGSS.MS-PS3-3