Energy Transformations

Which description of the energy conversions in this process is correct?

• The chemical energy in the fuel-air mixture is converted to thermal energy, which is then converted to mechanical energy

• The mechanical energy in the fuel-air mixture is converted to electrical energy, which is then converted to thermal energy

• The electrical energy in the fuel-air mixture is converted to mechanical energy, which is then converted to thermal energy

• The thermal energy in the fuel-air mixture is converted to electrical energy, which is then converted to mechanical energy

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112.18.b.9.C

Students build a circuit that has wires that connects a battery to a switch and a fan.

Which energy transformations happen when the students close the circuit and the blades of the fan begin to spin?

• Chemical to mechanical to electrical

• Electrical to chemical to mechanical

• Chemical to electrical to mechanical

• Mechanical to electrical to chemical

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112.18.b.9.C

Which energy transformation happens when the blades are spinning as shown?

• Electrical to mechanical

• Chemical to electrical

• Mechanical to electrical

• Chemical to mechanical

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112.18.b.9.C

Which statement describes the energy changes that occur when water in a tea kettle is heated on a stove that uses natural gas?

• Chemical energy to thermal energy to sound energy

• Thermal energy to sound energy to light energy

• Electrical energy to thermal energy to sound energy to light energy

• Light energy to chemical energy to kinetic energy to sound energy

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112.18.b.9.C

A cook heats a meal in a microwave oven. What energy transformations occur between the microwave oven and the meal?

• Electrical energy to light energy to chemical energy

• Chemical energy to thermal energy to light energy

• Electrical energy to electromagnetic energy to thermal energy

• Chemical energy to electromagnetic energy to chemical energy

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112.18.b.9.C

A teacher rubbed a match against a piece of sandpaper. The match started to burn. Which statement best describes the energy changes that occurred?

• The chemical energy stored in the match changed to thermal energy and light energy

• The thermal energy stored in the match changed to light energy and chemical energy

• The light energy and thermal energy stored in the match changed to mechanical energy

• The light energy and thermal energy stored in the match changed to chemical energy

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112.18.b.9.C

This appliance dries clothes primarily by converting -

• electrical energy to heat and mechanical energy

• mechanical energy to heat and electrical energy

• electrical energy to heat and light

• mechanical energy to heat and vaporization

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112.18.b.9.C

When a lion eats a zebra and then uses the energy from the zebra to run, the lion's body converts =-

• chemical energy to mechanical energy

• electrical energy to chemical energy

• chemical energy to light energy

• mechanical energy to chemical energy

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112.18.b.9.C

What energy transformations occur when propane gas is used to lift the balloon?

• Mechanical -> light -> chemical

• Chemical -> mechanical -> thermal

• Thermal -> chemical -> light

• Chemical -> thermal -> mechanical

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112.18.b.9.C

Match the following

• Battery

• Electrical Energy

• Electrical Outlet

• Thermal Energy

• Movement

• Mechanical Energy

• Heat

• Chemical Energy

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112.18.b.9.C