Energy and Devices

What is the main source of energy for the Earth?

• Coal

• Moon

• Sun

• Wind

How can we conserve energy at home?

• Leaving all lights on 24/7

• Using outdated, energy-consuming appliances

• Keeping electronics plugged in constantly

• By turning off lights when not in use, unplugging electronics when not charging, using energy-efficient appliances, adjusting thermostat settings, and insulating the home properly.

Explain the concept of potential energy.

• Potential energy is the energy an object has due to its speed

• Potential energy is the energy an object has due to its temperature

• Potential energy is the energy an object has due to its color

• Potential energy is the energy an object has due to its position relative to other objects.

Give an example of energy transfer from one object to another.

• Watching TV

• Pouring water from one glass to another

• Throwing a ball in the air

• Reading a book

Why is it important to use energy-efficient devices?

• Energy-efficient devices help reduce energy consumption, lower electricity bills, and decrease greenhouse gas emissions.

• Energy-efficient devices are more expensive to purchase initially

• Energy-efficient devices consume more electricity than traditional devices

• Energy-efficient devices are less reliable than traditional devices

Name three renewable sources of energy.

• Solar energy, Wind energy, Hydropower

• Biomass energy

• Geothermal energy

• Nuclear energy

What is the law of conservation of energy?

• Energy cannot be created or destroyed, only transferred or transformed.

• Energy can be created out of nothing

• Energy can be transformed into matter

• Energy can be destroyed completely

Describe the process of energy transfer in a simple electric circuit.

• Energy is transferred from the power source through the wires to the components via the flow of electrons.

• Energy is transferred through sound waves in the circuit

• Energy is transferred by the movement of protons in the circuit

• Energy is transferred by the heat generated in the circuit

How does insulation help in conserving energy?

• Insulation reduces the transfer of heat between the inside and outside of a building.

• Insulation only works during the summer months.

• Insulation has no impact on energy conservation.

• Insulation increases the transfer of heat between the inside and outside of a building.

What are the different forms of energy?

• Kinetic, potential, thermal, chemical, electrical, nuclear, and electromagnetic energy

• Kinetic, potential, thermal, chemical, electrical, and electromagnetic energy

• Potential, thermal, chemical, electrical, nuclear, and electromagnetic energy

• Mechanical, sound, light, magnetic, gravitational, and elastic energy