Potential Energy = Mass x Acceleration due to gravity x Height
Potential Energy = mgh

Mass = 70 kg
Acceleration due to gravity = 10 ms^-2
Height = 15 m

Potential Energy = 70 x 15 x 10
Potential Energy = 10,500 J

Light energy is converted into electrical energy.

NOTE: One must still conserve energy even when demand of energy is not high. Conversation will ensure that the resources used for the generation of the energy is reserved for future generations

A natural source of light is light that occurs naturally without the involvement of humans.

Natural sources of light can come from either an object or a living species.

Examples include the moon, Sun, stars, lightning, jellyfish, fireflies, glowworms, angler fish, etc.

A renewable source can replenish itself at the rate it is used, while a non-renewable source has a limited supply.

Renewable sources include timber, wind, and solar while non-renewable sources include coal and natural gas.

Renewable energy sources are environmentally friendly.

The energy of the sun is the original source of most of the energy found on earth. We get solar heat energy from the sun, and sunlight can also be used to produce electricity from solar (photovoltaic) cells. The sun heats the earth's surface and the Earth heats the air above it, causing wind.

Renewable energy is energy derived from natural sources that are replenished at a higher rate than they are consumed. Sunlight and wind, for example, are such sources that are constantly being replenished.

Renewable Energy

Renewable energy is defined as energy that is produced by natural resources—such as sunlight, wind, rain, waves, tides, and geothermal heat—that are naturally replenished within a time span of a few years.

A renewable energy source means energy that is sustainable - something that can't run out, or is endless, like the sun.

Sources of Renewable Energy

1. Solar energy
2. Wind energy
3. Hydro energy
4. Tidal energy
5. Geothermal energy
6. Biomass energy