OCR 21st Century Physics P2 Sustainable energy

What is the main component of a wind turbine that generates electricity?

• Rotor blades

• Gearbox

• Generator

• Tower

What is a major consideration when using nuclear energy?

• High carbon emissions

• Long-term storage of radioactive waste

• Dependence on weather conditions

• Low energy output

How much energy does a 100W light bulb transfer in 2 hours?

• 200J

• 7200J

• 200Wh

• 7200Wh

What is the primary function of a power station?

• To store energy

• To convert energy from one form to another

• To distribute energy

• To reduce energy consumption

A TV set uses 500 J of electrical energy.

The TV produces 100 J of sound energy and 300 J of heat energy.

It also produces light energy.

Complete and label the Sankey diagram to show the energy transfers in the TV set. [4 Marks]

TV set uses 500 J of electrical energy.

The TV produces 100 J of sound energy and 300 J of heat energy.

It also produces light energy. How much light energy is produced by the TV set? [1 Mark]

A new television is designed to be more efficient.

It uses 500 J of electrical energy to produce 120 J of light energy and 180 J of sound energy.

Calculate how efficient the new television is. [3 Marks]

What is the standard voltage of the mains supply in Great Britain?

• 110V

• 220V

• 230V

• 240V

What is the efficiency of an appliance that uses 500J of energy and transfers 100J as useful energy?

• 10%

• 20%

• 50%

• 80%

Which of the following is a benefit of solar power technology?

• High initial cost

• Dependence on fossil fuels

• Low maintenance costs

• Limited availability