What is the difference between useful energy and wasted energy?

What is both the useful and wasted energy from a light globe?

What is the wasted energy released by this example of an energy conversion?
Playing Cricket => Initial: Chemical Energy => Useful: Kinetic Energy => ____ Energy

What is energy efficiency?

What makes a device energy efficient or inefficient?

What is an example of an energy inefficient device?

What is the difference in energy efficiency between a car and a bicycle?

True or False:
The human body is more energy efficient than an electric motor.

What is the formula for energy efficiency?

A battery-operated remotes controlled car uses 1800J of chemical energy. It wastes 1350J of sound and heat energy. What is the percentage of the car's intial input energy that was wasted?

25% of a lawnmower's initial input energy (3200kJ) was converted into (useful) kinetic energy. What was the amount of useful output energy?

What is a way to tell if a device is energy efficient?

How many stars must a device have in order to be labelled as "super-efficient"?

What is insulation?

What is the National House Energy Rating Scheme?

What are three achievable improvements that can be done to house design?

What is one kilowatt hour, (kWh) equal to in both joules (J) and megajoules (MJ)?

What is the regenerative breaking system?

What are the materials that are used to make cars lighter?

What does LEDs stand for?