Energy Transformations

1. Which of the following best describes the type of energy transformation that occurs during photosynthesis?

• Chemical energy is transformed into magnetic energy.
• Thermal energy is transformed into light energy.
• Light energy is transformed into chemical energy.
• Electrical energy is transformed into mechanical energy.

2.  A wood fire transforms the chemical energy stored in wood into:

• light energy
• mechanical energy
• electrical energy
• nuclear energy

3.  Coal is the fuel source used to power steam engines.  Which statement best describes the energy transfer that takes place in a train powered by a steam engine?

• Some of the coal's chemical energy is transformed into mechanical energy, and some is released as heat and light.
• Most of the coal's chemical energy is destroyed as the coal is burned.
• Most of the coal's energy is captured and used to power the train.
• All of the coal's energy is lost as heat and light when it is burned.

4.  Fireworks transform chemical energy into:

• mechanical energy and electrical energy.
• sound energy and electrical energy.
• nuclear energy and sound energy.
• heat energy and light energy.

5.  A radio is a device that converts energy from one form to another.  Which of the following best describes the energy conversion process that takes place in a radio?

• Sound is created by energy stored in the speakers.
• Electrical energy is converted into sound energy.
• Some energy is released as sound, and the rest is destroyed.
• Electrical energy is converted into chemical energy and sound energy.

6.  Which of the following is an example of  a transformation of chemical energy into electrical energy?

• Sunlight providing power to a solar calculator
• A blowtorch welding two pieces of metal together
• An oil lamp lighting up a room
• A car battery making headlights shine

7.  A construction worker swings a hammer and hits a nail.  After the hammer hits the nail, mechanical energy is transformed into:

• light energy.
• electrical energy.
• heat energy and sound energy.
• wind energy and nuclear energy.

A windmill transforms the mechanical energy of the wind into:

• chemical energy.
• light energy.
• electrical energy.
• nuclear energy.

9.  A microwave transforms electrical energy into:

• heat, light, and sound energy.
• light and sound energy only.
• heat and sound energy only.
• heat energy only.

10.  A computer monitor transforms electrical energy into:

• mechanical energy and heat energy.
• chemical energy and nuclear energy.
• light energy and heat energy.
• sound energy and nuclear energy.