Energy transformation

Which form of energy is responsible for the body getting food?

• Mechanical

• light

• Chemical

• sound

Brendan and Maria are making a list of examples of how they use energy and the effects of this energy use. Which observation would be most useful to include in the list?

• Brendan makes music by plucking the strings of a guitar.

• Brendan pushes against a wall, but the wall does not move.

All the science students use devices that transform energy from one form into another. Which everyday object is useful because it transforms electrical energy into light energy?

• a television set

• a clothes dryer

• a solar-powered calculator

• a battery

Engineers at a toy company are designing a new toy firetruck. The toy will run on batteries. The engineers’ goal is that the toy should do everything that a real firetruck does, only on a smaller scale. Which energy transformations should be able to occur in the new toy firetruck?

• thermal energy to sound energy

• electrical energy to the energy of motion

• thermal energy to light energy

Amelia and Josie are investigating the electrical circuit shown here. Which is the most likely reason that the light bulb is not lit?

• A) The switch is closed, so current cannot flow through the switch.

• B) The wires do not form a closed circuit, or complete loop.

• C) The wires allow current to flow through the battery, but not the light bulb.

• D) The wires allow current to flow through the light bulb, but not the battery.

What is the purpose of the switch?

• The switch is necessary to form a closed circuit.

• The switch is a useful source of chemical energy for the circuit.

• The switch allows the circuit to be opened and closed easily.

• The switch prevents the circuit from being opened.

Danny rubs two balloons against a thick carpet, giving both the balloons a negative charge. What happens if Danny then holds the two balloons close together?

• The balloons push each other apart or repel.

• The balloons stick together.

• An electric current forms between the balloons.

• A spark of light, similar to a lightning bolt, forms between the balloons.

Which statement explains why copper is more useful in wires than plastic or glass?

• A. Copper is the better insulator of electricity.

• B. Copper is the better conductor of electricity.

• C. Copper can be drawn into thinner wires.

• D. Copper can be drawn into thicker wires.

What kind of energy is represented in this picture?

• Thermal
• Potential
• Nuclear
• Mechanical