1.8 Work, Energy and Power Flashcards
What is the definition of work done?
The product of a force and the distance moved in the direction of the force.
What is the definition of power?
The rate of doing work, P = W / t
What is the definition of efficiency?
The fraction of i out energy that does work, eff = Eout / Ein
What is the definition of kinetic energy?
The product of half the mass and the square of the velocity.
What is the definition of gravitational potential energy?
The product of mass, gravitational field strength and height.
What is the principle of conservation of energy?
Energy cannot be created or destroyed, merely transformed from one form to another.
What is energy conservation?
The act of serving energy by reducing the use of a service.
What is an example of energy conservation?
- Driving your car fewer miles per week.
- Unplugging appliances when not in use.
What is energy efficiency?
Saving energy but keeping the same level of service.
What are examples of energy efficiency?
- Replacing inefficient incandescent bulbs with efficient fluorescent bulbs.
- Washing clothes using cold water.
What are examples of environmental impacts?
- CO2 emissions.
- Global warming.
- Climate change.
What are examples of financial impacts?
- Reduced running costs so more disposable income.
- Boosts economy.
- Reduced taxation.
- Local labour used for instals so employment and economic growth.
What are examples of social impacts?
- Better quality of life.
- Improved well-being.
- Increased energy security.
