Wind,Solar and Geothermal

solar power

In sunny countries ________ is a very reliable source, but only in daytime.

Solar cells

________ are used to generate electricity on a small scale.

turbine

Each ________ has a generator inside it- the rotating blades turn the generator and produces electricity.

Initial costs

________ are high but after that the energy is free and running costs almost zero.

Solar cells

________ generate electric currents directly from sunlight.

Solar power

________ is often used in remote places where theres not much choice, such as the Australian outback) and to power electric road signs and satellites.

Solar cells

________ are often the best source of energy to charge batteries in calculators and watches which dont use much electricity.