Renewable energy sources

Renewable energy sources theoretically can be used indefinitely

• TRUE

• FALSE

• IN PART

• FOR A LIMITED TIME

The electricity produced from the sun’s rays is called ....

• insular energy

• sunnier energy

• solar energy

• sunny energy

The amount of solar energy streaming towards the Earth in only one day equals the energy that is produced by burning 5550 tons of coal

• TRUE

• FALSE

Solar energy can be produced directly from the sun:

• ·         by absorbing and storing the sun to be used,

  ·         by converting sunlight to electricity using photovoltaic cells.

• ·         by absorbing the heat and storing it to be used, for example for heating buildings and water;

  ·         by burning photovoltaic cells.

• ·         heating buildings and water under the sun;

  ·         by converting sunlight to electricity using photovoltaic cells.

• ·         by absorbing the heat and storing it to be used, for example for heating buildings and water;

  ·         by converting sunlight to electricity using photovoltaic cells.

there are two types of solar panel systems

• solar photovoltaic and wind thermal systems

• solar photovoltaic and solar thermal systems

• solar photos and solar thermal systems

• solar photovoltaic and nuclear thermal systems

what material can be called a semiconductor?

• silicon, cadmium telluride and other materials

• acrylate and varnish

• metal and in particular copper

• fibreglass, wood, or composite materials

solar photovoltaic are more efficient converters of sunlight, they are also more expensive

• TRUE

• FALSE

Hydroelectric dams are very expensive to build, so it is not convienent to build them

• TRUE

• FALSE

Answer explanation

It is convenient once the station is built, the water comes free of charge

Biogas can be used instead of natural gas for heating and cooking... but where can we find them?

• in forest and vegetations

• in mammals butane and methane

• in mammals' excrements

• in mammals' excrements and decomposed vegetation

Biomass is organic material which has stored sunlight in the form of chemical energy. Biomass fuels include...

• wool, wool waste, jackets, sugar cane, and many others

• wood, wood waste, straw, manure, sugar cane, and others

• wasteland, straw, mature, sugar can, and many others

• wood, wood waste, straw, manure, sugar dogs and so on