Energy

What is the primary source of energy for all living organisms?

• Fire

• Sun

• Water

• Wind

Explain the difference between potential and kinetic energy.

• Potential energy is energy in motion, while kinetic energy is stored energy.

• Potential energy is the energy of an object at rest, while kinetic energy is the energy of an object in motion.

• Potential energy is the energy of an object in motion, while kinetic energy is the energy of an object at rest.

• Potential energy is stored energy, while kinetic energy is energy in motion.

Give an example of each of the following forms of energy: mechanical, thermal, and chemical.

• Mechanical: Moving car, Thermal: Hot cup of coffee, Chemical: Gasoline

• Mechanical: Stationary car

• Chemical: Battery

• Thermal: Cold cup of water

Describe how energy is transformed when a toaster is used to make toast.

• Electrical energy is converted into heat energy to toast the bread slices.

• The toaster transforms light energy into chemical energy.

• The toaster changes mechanical energy into electrical energy.

• The toaster converts sound energy into heat energy.

What is the law of conservation of energy?

• Energy can only be transformed into matter

• Energy cannot be created or destroyed, only transferred or transformed from one form to another.

• Energy can be destroyed completely

• Energy can be created out of nothing

How is electrical energy generated in a hydroelectric power plant?

• By using solar panels to directly convert sunlight into electricity.

• By burning fossil fuels to heat water and produce steam that drives turbines.

• By harnessing wind energy to power turbines connected to generators.

• By converting the potential energy of water into kinetic energy using turbines connected to generators.

Discuss the concept of energy efficiency and why it is important.

• Energy efficiency is not important as it leads to higher energy consumption

• Energy efficiency does not impact energy bills or greenhouse gas emissions

• Promoting energy efficiency hinders sustainability efforts

• Energy efficiency is important because it helps reduce energy consumption, lower energy bills, decrease greenhouse gas emissions, and promote sustainability.

Explain the process of energy transformation in a solar panel.

• The process of energy transformation in a solar panel involves converting sunlight into electricity through the photovoltaic effect, generating DC electricity in the silicon cells, and then converting it into AC electricity using an inverter.

• The process of energy transformation in a solar panel involves converting wind energy into electricity

• Energy transformation in a solar panel occurs by converting water into electricity

• Solar panels absorb heat from the sun and convert it directly into electricity

What are the different types of renewable energy sources?

• Oil

• Solar, Wind, Hydroelectric, Geothermal, Biomass

• Nuclear

• Coal

How does energy play a role in climate change?

• Energy has no impact on climate change

• Renewable energy sources have no effect on climate change

• Energy consumption has a positive effect on climate change

• Burning of fossil fuels releases greenhouse gases that trap heat in the atmosphere, contributing to global warming and climate change.