Energy 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.

Energy transformations occur when...

• energy is created through conduction
• energy changes from one form to another
• two forces slide together that are touching
• a chemical reaction takes place

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 type of energy transformation occurs when a flashlight shines?

• chemical → thermal → electrical
• chemical → electrical → light
• thermal → chemical → light
• chemical → electrical → chemical

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
• mechanical → electrical → light

A lamp that plugs into a wall socket draws energy which flows through a thin wire in the bulb that gets hot, causing it to glow. What energy transformations are taking place?

• chemical → light → electrical

• mechanical → sound → light

• thermal → solar → electrical

• electrical → thermal → light

Which of the following shows the correct order of the energy transformations that occur when green plants produce their food from the Sun’s energy?

• chemical → thermal
• light → chemical
• thermal → light
• chemical → electrical

In a solar panel, Solar Energy is transferred to _____ Energy.

• Mechanical

• Solar

• Sound

• Electrical

In an oven, Electrical Energy is transferred to _____ Energy.

• Thermal

• Solar

• Electrical

• None

People get energy from the food that they eat and transform that energy as they move. Which energy transformations occur as a student walks to class?

• mechanical to thermal

• chemical to mechanical

• mechanical to chemical

• chemical to sound