FWE Part 1 - Energy PPT Slides Flashcards
(29 cards)
Where does most of the energy on Earth come from?
The sun.
What process do plants use to convert sunlight into energy?
Photosynthesis.
What type of energy is transferred to humans when they eat plants?
Chemical potential energy.
What are the primary fossil fuels used for energy?
- Coal * Oil * Natural gas.
What is the origin of fossil fuels?
Remains of dead plants and animals buried in Earth.
What is the first step in generating electricity from fossil fuels?
A fuel is burnt and heat is given off to boil water in the boiler.
What energy conversion occurs in the boiler of a power station?
Chemical potential energy of fuel to thermal energy of water.
What happens to water in the power generation process?
Water turns into steam at high pressure.
What type of energy is converted to electrical energy in a generator?
Kinetic energy of turbines.
What is the sequence of energy conversion in electricity generation?
Chemical potential energy (fossil fuel) → thermal energy (water) → kinetic energy (steam) → kinetic energy (turbine) → electrical energy (generator).
True or False: Burning fossil fuels contributes to global warming.
True.
Which fossil fuel generates more pollution: coal or oil?
Coal.
What is one limitation of solar energy?
Availability of sunlight.
How do solar panels generate electricity?
They produce electricity when exposed to light.
What is a wind farm?
A collection of wind turbines that convert energy from wind to electrical energy.
What is the energy conversion process in a wind farm?
Kinetic energy (wind) → kinetic energy (wind turbine) → electrical energy (generator).
What environmental impact can wind farms have?
- Loss of wildlife * Noise pollution.
What type of energy is generated by hydroelectric power stations?
Electrical energy from moving water.
What is the energy conversion process in hydroelectric energy generation?
Gravitational potential energy (water) → kinetic energy (water) → kinetic energy (turbine) → electrical energy (generator).
What is geothermal energy?
Heat from Earth’s core harnessed to generate electricity.
What is one environmental concern associated with geothermal energy?
Destruction of habitats of wildlife.
What are biofuels made from?
- Animal waste * Plant materials that cannot be eaten by humans.
Give an example of a biofuel.
Ethanol.
What is the energy conversion process in a vehicle using biofuels?
Chemical potential energy (biofuel) → thermal energy (air in engine) → kinetic energy (vehicle).
