Input Output Energy

The law of conservation of energy states that when one form of energy is converted into another,

• energy is destroyed in the process
• no energy is destroyed in the process
• energy is created in the process
• some amount of energy cannot be accounted for

Tags

NGSS.MS-PS3-5

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

• heat
• chemical energy
• light
• sound waves

Tags

NGSS.MS-PS3-5

Efficiency is calculated by useful energy output divided by total energy input, expressed as a percentage

• False

• True

When is energy lost?

• During transformations only

• During transformations and transfers

• During transfers only

• During GPS outages

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Could you ever have a device that provides an efficiency of over 100%?

• True

• False

• Can't Say

What would the total input energy have to be for a light bulb that is 90% efficient and transfers 40 J of light.

• 44 J

• 44 %

• 44 W

• 44 J/s

Calculate the efficiency for a wind turbine that transforms 500 J of kinetic energy in the wind to 150 J of electrical energy and 350 J of wasted heat and sound energy.

• 33.33 %

• 0.03 %

• 30 %

Rex has a remote controlled car.It is 35% efficient,transferring 90 J of total energy into useful kinetic energy.Calculate the total input energy .

• 275.14 J

• 257.14 J

Tags

NGSS.MS-PS3-5