Conservation of Energy

What is energy transformation?

• Energy transformation is the process of changing matter into energy.

• Energy transformation is the process of changing energy into matter.

• Energy transformation is the process of changing one form of energy into another.

• Energy transformation is the process of changing the speed of light.

Answer explanation

Energy transformation is the process of changing one form of energy into another.

State the Law of conservation of energy.

• Energy can be destroyed and created at will.

• Energy is only conserved in closed systems.

• Energy conservation is not applicable to mechanical systems.

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

Answer explanation

The Law of conservation of energy states that energy cannot be created or destroyed, only transferred or converted from one form to another.

Define useful energy.

• Energy that is harmful and detrimental to the environment.

• Energy that is wasted and not utilized for any purpose.

• Energy that is converted into a form that is easily usable and beneficial for performing work or tasks.

• Energy that is only used for recreational activities.

Answer explanation

Useful energy is defined as energy that is converted into a form that is easily usable and beneficial for performing work or tasks.

Explain the concept of dissipation.

• Dissipation only occurs in mechanical systems and not in other forms of energy.

• Dissipation is the process of energy being transformed from one form to another, typically into heat, and being lost in the system.

• Dissipation involves the creation of new energy within a closed system.

• Dissipation is the process of energy being stored in a system indefinitely.

Answer explanation

Dissipation is the process of energy being transformed from one form to another, typically into heat, and being lost in the system.

What is meant by wasted energy?

• Energy that is generated from renewable sources.

• Energy that is not utilized for any productive purpose.

• Energy that is efficiently used for productive purposes.

• Energy that is stored for future use.

Answer explanation

Wasted energy refers to energy that is not utilized for any productive purpose, making it the correct choice.

How can energy conservation and efficiency be achieved?

• Using outdated technology and equipment

• Implementing energy-efficient practices and promoting renewable energy sources.

• Ignoring energy consumption habits

• Relying solely on fossil fuels

Answer explanation

Energy conservation and efficiency can be achieved by implementing energy-efficient practices and promoting renewable energy sources, which help reduce overall energy consumption and reliance on fossil fuels.

Define the efficiency of a machine.

• Efficiency of a machine is a measure of how well it converts input energy into useful output energy.

• Efficiency of a machine is a measure of its color.

• Efficiency of a machine is a measure of how fast it can operate.

• Efficiency of a machine is a measure of its weight.

Answer explanation

Efficiency of a machine is a measure of how well it converts input energy into useful output energy.

Give an example of energy transformation.

• Hydroelectric dam producing electricity from water

• Car engine burning gasoline

• Wind turbine generating electricity from wind

• Solar panel converting sunlight into electricity

Answer explanation

The correct example of energy transformation is a car engine burning gasoline, where chemical energy from gasoline is converted into mechanical energy to power the vehicle.

Discuss the importance of energy conservation.

• Energy conservation is important for reducing greenhouse gas emissions, preserving natural resources, and lowering energy costs.

• Energy conservation is not important for reducing greenhouse gas emissions

• Energy conservation does not help in preserving natural resources

• Energy conservation does not impact energy costs

Answer explanation

Energy conservation is crucial for reducing greenhouse gas emissions, preserving natural resources, and lowering energy costs, making it an essential practice for sustainability and environmental protection.

Explain how to calculate the efficiency of a machine.

• Efficiency = (Useful work output / Total energy input) * 100%

• Efficiency = Total energy input - Useful work output

• Efficiency = Useful work output / Total energy input

• Efficiency = (Total energy input / Useful work output) * 100%

Answer explanation

Efficiency is calculated by dividing the useful work output by the total energy input and then multiplying by 100%.