Primary energy sources (meaning energy is created directly from the actual resource) can be classified in two groups: nonrenewable or renewable. Secondary sources are derived from primary sources.
[Nonrenewable] Energy Sources – Energy from the ground that has limited supplies, either in the form of gas, liquid or solid, are called nonrenewable resources. They cannot be replenished, or made again, in a short period of time. Examples include: oil (petroleum), natural gas, coal and uranium (nuclear). Oil, natural gas and coal are called ‘fossil fuels’ because they have been formed from the organic remains of prehistoric plants and animals.
Renewable Energy Sources – Energy that comes from a source that’s constantly renewed, such as the sun and wind, can be replenished naturally in a short period of time. Because of this we do not have to worry about them running out. Examples include: solar, wind, biomass and hydropower. Currently, about 20% of the world’s electricity comes from renewable resources. There is a global debate as to whether geothermal energy is renewable or nonrenewable.
Secondary Energy Sources – Energy that is converted from primary sources are secondary sources of energy. Secondary sources of energy are used to store, move, and deliver energy in an easily usable form. Examples include electricity and hydrogen.”
a) coal; b) wind; c) hydrogen; d) geothermal; e) hydropower; f) solar; g) biomass; h) nuclear; i) oil; j) electricity; k) natural gas.
PHOTOS: A- JOHN_KASAWA/ISTOCKPHOTO, B- CARD76/ISTOCKPHOTO, C- CLEMENS BILAN/AFP/GETTY IMAGES, D- CHRISPOLE/ISTOCKPHOTO, E- KEITHSZAFRANSKI/ISTOCKPHOTO, F- JASON DOIY/ISTOCKPHOTO, G- ANDREI MERKULOV/ISTOCKPHOTO, H- MICHAELUTECH/ISTOCKPHOTO, I- LEOFRANCINI/ISTOCKPHOTO, J- LISA VALDER/ISTOCKPHOTO, K- HAZLAN ABDUL HAKIM/ISTOCKPHOTO
2 Choose one of the energy sources mentioned in activity 1 and read about its pros and cons. Then work in groups of three with classmates that have read about other energy sources and share your information.