Unit 4 AOS 2 - Energy Use

Which one of the following lists the energy form conversions in the correct order, from the coal in the power station to electricity in the grid? (VCAA 2022)

• potential → thermal → kinetic → thermal → kinetic → electrical

• chemical → kinetic → kinetic → mechanical → thermal → electrical

• potential → potential → thermal → potential → mechanical → electrical

•  chemical → thermal → thermal → mechanical → mechanical → electrical

What is the approximate overall energy efficiency of this coal-fired power station? (VCAA 2022)

• 20%

• 32%

• 40%

• 80%

Where do fully electric vehicles originally source their energy from? (VCAA 2022)

• the electric motor

• the battery system in the vehicle

• the internal combustion engine

• an energy source such as wind or coal

Vehicles powered by petrol and diesel engines are very inefficient at converting the fossil fuel in their tanks into motion of the wheels, with over 60% of the energy lost as heat. This inefficiency is explained by (VCAA 2022)

• the first law of thermodynamics.

• the second law of thermodynamics.

• the level of emissions due to the combustion of fuel.

• heavy traffic in many cities and constant speeding and braking by many motorists.

Which one of the following is a statement of the first law of thermodynamics? (VCAA 2020)

• The temperature of the world is steadily rising.

•  The total energy of an isolated system is constant.

• The temperature of an isolated system steadily rises.

• The total energy of an isolated system steadily decreases.

The complete combustion of natural gas produces (VCAA 2018)

• methane and ozone.

• oxygen and nitrogen.

• various hydrocarbons.

• carbon dioxide and water vapour.

Which one of the following lists contains only non-fossil energy sources? (VCAA 2018)

• coal, nuclear, natural gas, wind

• nuclear, hydro-electric, wind, solar

• hydro-electric, solar, wind, natural gas

• nuclear, hydro-electric, oil, wind

Which of the following factors are required for the formation of fossil fuels? (VCAA 2018)

• decaying organic material, heat, pressure

• oceans, layers of sediment, millions of years

• plant and animal matter, heat, thousands of years

• swamp plants, combustion, carbon dioxide, millions of years