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Energy Transfer Worksheet

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Energy Transfer Worksheet

Choose one answer for each multiple-choice question. For written responses, explain your thinking and use scientific terms where helpful.

Energy transfer and transformation

Thermal energy can move through direct contact between particles, especially in solids. It can also be carried as liquids or gases move: warmer, less dense fluid rises while cooler fluid sinks. Another method transfers energy by electromagnetic waves and can travel through empty space. Energy transformation means energy changes from one form to another.

Multiple choice

Select the best answer.

1.A stainless-steel fork is left in a hot kumara soup. After a while, its handle feels warm. Which process transferred energy along the fork?

Convection
Conduction
Radiation
Energy transformation

2.Energy from the Sun reaches Earth across the near-empty space between them. How is this energy transferred?

Conduction
Convection
Radiation
Sound waves

3.A heater warms the air beside it. The warmed air rises, and cooler air moves in to take its place. Which transfer process is taking place?

Conduction
Convection
Radiation
Condensation

4.A battery-powered torch produces a beam of light and also becomes slightly warm. Which statement best describes this?

Electrical energy is transferred by convection only.
Chemical energy is transformed into light and thermal energy.
Thermal energy is transformed into chemical energy.
Radiation is transformed into a battery.

5.Which material would transfer thermal energy most readily through direct contact?

Copper
Wool
Timber
Foam

6.A person stands near a brazier without touching it. They are warmed by energy travelling directly across the gap as electromagnetic waves, and are not in the hot airflow. Name the main method of energy transfer.

7.Above a radiator, the air becomes warmer and rises while cooler air sinks. Name the energy-transfer process described.

8.A person holds one end of a metal bar while the other end is placed in hot water. Name the main process transferring energy through the bar.

9.Describe how energy moves through a solid from a hotter region to a cooler region. Include what happens to particles when the solid is heated.

10.At a zoo, Ana sees a solar-powered ventilation fan moving air in an animal shelter. Trace the energy transformations from sunlight to the moving air.

11.On a clear day, a dark jacket often becomes warmer in sunlight than a white jacket. Explain why, using the term energy transfer by electromagnetic waves.

12.A shelter is kept at 19°C while the outside air is 6°C. Suggest two ways to reduce thermal energy loss and identify the main transfer process each method reduces.