solar

Explains how the Sun, which is the ultimate source of all energy on earth, can be used to provide electricity and power.

Examines solar energy, its history, uses, advantages and disadvantages, and new developments in the field.

Discusses hydroelectricity and how it is made and used. Includes one simple experiment.

Describes the use of solar power since early times, the science which explains how solar power works, and its advantages and disadvantages. Includes one simple experiment.