Fundamentals Of Energy And Heat Transfer

1. What are the different types of energy?

Types of energy: mechanical, chemical, geothermal, radiant.

Types of energy light, sound, gravitational potential (object above earths surface), electrical, kinetic (moving), elastic (stretched), thermal, nuclear

Types of energy: solid, liquid, gas, plasma.

Types of energy: speed, pressure, density, temperature.

The correct answer lists different types of energy referring to various forms such as light, sound, gravitational potential, electrical, kinetic, elastic, thermal, and nuclear. The incorrect answers do not accurately represent the types of energy.

Explanation

The correct answer lists different types of energy referring to various forms such as light, sound, gravitational potential, electrical, kinetic, elastic, thermal, and nuclear. The incorrect answers do not accurately represent the types of energy.

2. Which of the following renewable energy sources converts light into electricity?

Biomass

Geothermal

Wind

Solar energy is generated by solar cells that convert light into electricity. Wind energy uses turbines to generate electricity from wind, geothermal energy utilizes heat from within the Earth, and biomass energy is derived from organic materials.

Explanation

Solar energy is generated by solar cells that convert light into electricity. Wind energy uses turbines to generate electricity from wind, geothermal energy utilizes heat from within the Earth, and biomass energy is derived from organic materials.

3. How is electricity generated and transmitted through The National Grid?

3- Geothermal energy is extracted from underground to generate electricity in a sustainable manner.

2- Wind turbines harness wind energy to produce electricity without the need for fuel.

1- Solar panels are used to directly generate electricity through sunlight.

4. What are the disadvantages of using Fossil Fuels?

Low start up time

High start up time

No greenhouse gases produced, renewable, no fuel costs

WindAdvantages – no Greenhouse gases produced, renewable, no fuel costsDisadvantages – noise and visual pollution, won’t always work

5. Radiation travels as waves, known as thermal/infra red radiation. The heat from the sun reaches us in this way, the waves can travel through a vacuum.

Black/dark surfaces emit less thermal radiation. Polar bears are black so they emit less thermal radiation.

Shiny surfaces emit less thermal radiation. Polar bears are shiny so they emit less thermal radiation.

Blue surfaces emit less thermal radiation. Polar bears are blue so they emit less thermal radiation.

Emitters of radiationWhite/silver surfaces emit less thermal radiation. Polar bears are white so they emit less thermal radiation.

Different surfaces emit different amounts of thermal radiation based on their color and material composition. In this case, white/silver surfaces emit less thermal radiation compared to black/dark surfaces, shiny surfaces, or blue surfaces. This is why polar bears, being white, emit less thermal radiation.

Explanation

Different surfaces emit different amounts of thermal radiation based on their color and material composition. In this case, white/silver surfaces emit less thermal radiation compared to black/dark surfaces, shiny surfaces, or blue surfaces. This is why polar bears, being white, emit less thermal radiation.

6. Which of the following is NOT a method for reducing heat loss?

Using double glazing with a layer of air to slow down conduction.

Adding loft insulation to take advantage of convection.

Choosing larger objects with a smaller surface area to volume ratio.

The correct answer is using silver materials to increase thermal radiation emitted because silver materials are actually used to reduce thermal radiation and therefore reduce heat loss.

Explanation

The correct answer is using silver materials to increase thermal radiation emitted because silver materials are actually used to reduce thermal radiation and therefore reduce heat loss.

7. How is cold water heated using rocks within the Earth to drive turbines in geothermal energy?

Harnessing wind energy to directly power turbines.

Burning fossil fuels to generate steam.

ColoursDark colours absorb more heat.Light colours reflect more heat

Using mirrors to concentrate sunlight onto water.

Geothermal energy involves utilizing the Earth's natural heat to generate power, not sunlight, fossil fuels, or wind energy.

Explanation

Geothermal energy involves utilizing the Earth's natural heat to generate power, not sunlight, fossil fuels, or wind energy.

8. What is a potential source of electricity that does not produce greenhouse gases, but requires the disposal of hazardous waste?

Coal

Solar

Wind

Nuclear power is a source of electricity that does not produce greenhouse gases, but has the disadvantage of producing hazardous waste that must be dealt with. Coal, solar, and wind energy sources do not have the same characteristics as nuclear power in terms of greenhouse gas production and hazardous waste disposal.

Explanation

Nuclear power is a source of electricity that does not produce greenhouse gases, but has the disadvantage of producing hazardous waste that must be dealt with. Coal, solar, and wind energy sources do not have the same characteristics as nuclear power in terms of greenhouse gas production and hazardous waste disposal.

Fundamentals of Energy and Heat Transfer