Energy Transfers and Transformations

The Theory of the Conservation of Energy states -

• Energy can be created, just not destroyed. It changes its form from one type to another.

• Energy can never be created nor destroyed. It can only change its form from one type to another.

• The total energy in our Universe changes, as different forms of energies can be transformed from each other under certain circumstances.

• Energy transformations do not passively occur in our lives, rather we actively make use of energies and transform energies.

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Which type of energy transformation occurs when a flashlight shines?

• chemical → thermal → electrical

• chemical → electrical → light

• thermal → chemical → light

• chemical → electrical → chemical

Some students observing a classroom device being used, noticed the below energy transformations. 
Electrical → Mechanical → Sound
Which device were the students most likely observing?

• A triple beam balance measuring an object’s mass.

• A pencil sharpener plugged into a wall outlet.

• A projector displaying a diagram on the screen.

• A working flashlight used to light up a dark corner.

Which kind of energy change occurs when a candle is burning?

• Chemical to light.

• Light to electrical.

• Solar to heat.

• Chemical to electrical.

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When water falls through a dam and turns a turbine connected to a generator, electricity is produced. This electricity is often used to light our homes and offices. Which of the following shows the energy transformations that occurs?

• electrical → light → mechanical

• chemical → mechanical → electrical

• mechanical → chemical → light

• gravitational potential→ mechanical → electrical 

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What is the energy transformation?

• Electrical to Electromagnetic

• Mechanical to Electrical

• Electrical to Thermal

• Kinetic to Sound

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What is the energy transformation?

• Mechanical to Kinetic to Sound

• Mechanical to Electrical to Light

• Electrical to Thermal to Mechanical

• Kinetic to Sound to Potential

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The Electrical Energy of the stove is transferred to _____ Energy.

• Solar

• Thermal

• Potential

• Electrical

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Which items would have this energy transformation: chemical energy -> light energy?

• Flashlight

• Glow stick

• wind up car toy

• computer

Calculate the kinetic energy of a moving 4 kg object travelling at a velocity of 3 m/s.

• 18 J

• 36 J

• 12 J

• 6 J

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