Energy (1)

Energy is the ability to do work.

Plants convert light energy from the Sun, carbon dioxide and water into food (sugar).

All energy available on Earth comes from the Sun through the process of photosynthesis.

Solar, wind, wave energy, biomass and geothermal energy and hydropower are examples of renewable energy.

Solar cells can collect energy from the Sun to power satellites and calculators.

Solar energy can be transformed into electricity using the photovoltaic (PV) panels.

Disadvantages of using electricity that is generated by solar energy:

v The Sun’s rays are too scattered and irregular.

v It can be interrupted by the cloud cover.

v The cost of setting up the PV panel may be high.

Energy is constantly changing from one form to another.