Conservation of Energy and Energy Transfers

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

According to the Law of Conservation of energy, the amount of energy before and after a reaction must be the same. Which statement below is true?

• The total amount of energy is conserved
• The total amount of energy is less after a reaction
• The total amount of energy is more after a reaction

Tags

NGSS.MS-PS3-5

Which energy transformation below matches?
A book falling?

• chemical to sound and heat
• kinetic to sound and heat
• electrical to sound and heat

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which is an example of a single energy transformation?

• A toaster converts electrical to thermal energy

• A match converts mechanical to thermal to electromagnetic

• A biker converts chemical to mechanical to thermal

• A car converts chemical to thermal to mechanical

What is an example of multiple energy transformations?

• Your body transforms chemical to thermal

• Your body transforms chemical to mechanical

• a flashlight converts chemical energy in batteries to electrical to electromagnetic energy in light

• a phone converts electrical to electromagnetic

Tags

NGSS.MS-PS3-5

Which of the following energy transformations occur when a lamp that is plugged into a wall socket is functioning correctly?

• Chemical to light
• Electrical to chemical
• Electrical to light
• Chemical to electrical

What energy transformations take place when a battery-operated radio is in use?

• Electrical to chemical to light
• Sound to chemical to mechanical
• Chemical to electrical to sound
• Light to electrical to thermal

Turning on a lamp is an example of energy transformation from electrical to 3 forms of energy. Which of these is NOT created by the lamp?

• radiant
• light
• heat
• chemical

When electrical energy flows through a light-bulb it creates ___ 

• heat energy only
• heat and radiant energy
• radiant energy only
• motion energy

When you plug in an iron, electrical energy is transformed into ______ energy

• sound
• mechanical
• thermal (heat)
• radiant