IGCSE Energy Resources

Front

What is geothermal energy?

Back

Geothermal energy is the heat that comes from the sub-surface of the earth. It can be found in the hot water and steam that are trapped beneath the earth's surface and is used for heating homes and generating electricity.

Front

How is the efficiency of a generator calculated?

Back

Efficiency is calculated using the formula: Efficiency (%) = (Output Power / Input Power) x 100. For example, if a generator produces 200 V and 3.0 A, the output power is 600 W. If the input power is 2400 W, the efficiency is (600/2400) x 100 = 25%.

Front

What is passive solar design?

Back

Passive solar design refers to the use of building materials and design techniques that naturally collect, store, and distribute solar energy for heating and cooling without mechanical systems. Examples include solar ovens and green roofs.

Front

What unit is energy measured in?

Back

Energy is measured in Joules (J).

Front

What is nuclear fission?

Back

Nuclear fission is the process in which a large nucleus splits into two smaller nuclei, releasing energy, neutrons, and gamma radiation.

Front

What is the primary source of solar energy?

Back

The primary source of solar energy is the sun, which emits energy in the form of sunlight that can be harnessed for various applications.

Front

What is the difference between active and passive solar energy systems?

Back

Active solar energy systems use mechanical devices to collect and convert solar energy (e.g., solar panels), while passive systems rely on building design and materials to naturally collect and utilize solar energy.

Front

What is the role of biofuels in energy resources?

Back

Biofuels are renewable energy sources made from organic materials (biomass) that can be used for heating, electricity generation, and as transportation fuels.

Front

What is hydroelectric energy?

Back

Hydroelectric energy is generated by using the flow of water to turn turbines, which then produce electricity. It is a renewable energy source.

Front

What is the significance of energy efficiency?

Back

Energy efficiency refers to using less energy to provide the same service or output. It is important for reducing energy consumption, lowering costs, and minimizing environmental impact.