GCSE Physics: Energy and Heat Transfer

What is the formula for calculating efficiency in energy transfer?

• Efficiency = (useful energy output / total energy input) - 100%

• Efficiency = (useful energy output - total energy input) x 100%

• Efficiency = (useful energy output / total energy input) x 100%

• Efficiency = (useful energy output + total energy input) x 100%

Explain how a Sankey diagram is used to show energy transfers.

• A Sankey diagram is used to display the distribution of population in different regions.

• A Sankey diagram shows the movement of water through a system of pipes.

• A Sankey diagram shows the flow of energy from one source to another through the width of arrows.

• A Sankey diagram illustrates the process of photosynthesis in plants.

Give an example of a renewable energy source and explain how it works.

• Wind power

• Coal power

• Nuclear power

• Solar power

What are the advantages and disadvantages of using non-renewable energy sources?

• Advantages: Unlimited supply. Disadvantages: Expensive and unreliable.

• Advantages: Low cost. Disadvantages: Harmful emissions and pollution.

• Advantages: Reliable and readily available. Disadvantages: Limited supply and environmental impact.

• Advantages: Easy to transport. Disadvantages: High maintenance and safety risks.

Define conduction and give an example of it in everyday life.

• When a glass spoon sitting in a hot cup of coffee becomes warm.

• When a plastic spoon sitting in a hot cup of coffee becomes warm.

• An example of conduction in everyday life is when a metal spoon sitting in a hot cup of coffee becomes warm.

• When a wooden spoon sitting in a hot cup of coffee becomes warm.

Explain how convection occurs and give an example of it in nature.

• Convection happens when the Earth's atmosphere is heated by volcanic eruptions, causing warm air to rise and cool air to sink, creating wind and weather patterns.

• One example of convection in nature is the heating of the Earth's atmosphere by the sun, causing warm air to rise and cool air to sink, creating wind and weather patterns.

• Convection occurs when the Earth's atmosphere is heated by the moon, causing warm air to rise and cool air to sink, creating wind and weather patterns.

• An example of convection in nature is the movement of ocean currents due to the rotation of the Earth.

What is radiation and how does it transfer heat energy?

• Radiation is the transfer of heat energy through sound waves

• Radiation is the transfer of heat energy through electromagnetic waves.

• Radiation is the transfer of heat energy through convection

• Radiation is the transfer of heat energy through conduction

Compare the efficiency of energy transfer in renewable and non-renewable energy sources.

• Non-renewable energy sources are more efficient

• Renewable energy sources are more efficient

• There is no difference in efficiency between renewable and non-renewable energy sources

• Renewable energy sources are less efficient

Draw a simple Sankey diagram to show the energy transfers in a car engine.

• Make a scatter plot to display the energy transfers in a car engine.

• Draw a pie chart to show the energy transfers in a car engine.

• Create a bar graph to illustrate the energy transfers in a car engine.

• Draw a simple Sankey diagram to illustrate the energy transfers in a car engine.

Discuss the impact of energy efficiency on the environment and economy.

• Energy efficiency has no impact on the environment or economy

• Energy efficiency is too expensive and not worth the investment

• Energy efficiency only benefits the environment, not the economy

• Energy efficiency helps in reducing environmental impact and can lead to cost savings, benefiting both the environment and the economy.