Quick Write: Explain the difference between efficiency and inefficiency Efficiency means almost no energy is wasted. Inefficiency means energy is wasted.

Which lamp is more efficient? Light Energy Heat Energy Light Energy The white lamp is more efficient because it is NOT wasting energy on heat

Adapted by T. Trimpe

Game Rules and Procedures Each table is 1 team. No changing tables or teams! Each team gets 1 dry erase board, 1 marker and 1 eraser. One person is in charge of writing down answers. Write your team’s number at the top of your dry erase board. NEVER erase it.

Scoring System Correct Answer: 1 point Incorrect Answer: no point Arguing with team: lose a point Talking during game: lose a point (don’t accidentally give away your answers!!) Being disruptive: lose a point

Don’t Forget... Contestants

Although they give answers in the form of questions on the TV show, you do not need to do this. You do need to write your answers on your team’s game board! The winning team gets panther tickets!!

Energy which vibrates air molecules

sound energy

Two types of energy which fuel the human body

Light and chemical

The kinetic energy of movement

Mechanical

The kinetic energy of flowing electrons

Electrical

A system that uses the LEAST amount of energy to get a job done is called…

Efficient

A change from one form of energy to another

Transfer or Transformation

A system that wastes the most energy is called…

inefficient

The potential energy stored in bonds between atoms

Chemical

Energy of heat

thermal

Plants use photosynthesis to transform _____________ energy to chemical energy.

Light/radiant energy

Energy is neither _____________ nor ___________; it gets transformed from one form to another.

created /destroyed

People use the chemical energy from plants and other animals and convert it to ______________ energy to stay warm and _______________ to move.

Thermal energy and mechanical energy

Batteries transfer chemical energy to electrical energy. What is another name for energy that has been released?

Kinetic energy

A lamp plugs into a wall. It draws energy through a wire which makes the bulb turn hot and start to light up. What is the energy transfer?

Electrical to Thermal to Light (electrical is the energy moving through the wires, thermal is the bulb heating up, light is the bulb lighting up)

For the next question, give me an example of energy transfer. You may NOT use potential to kinetic energy.

Plants producing food

Light chemical

Stored energy

Potential or chemical

A force on a surface that opposes motion is called…

FRICTION

Does friction increase or decrease the efficiency of a system?

Friction DECREASES efficiency (Friction is a force opposing motion. Motion is released energy. The more friction, the less motion, the less released energy)

Light bulb A produces lots of light and lots of heat. Light bulb B produces lots of light and no heat. If the purpose of the light bulb is to produce light only, which bulb is more energy efficient: A or B?

Light bulb B (Light bulb A is wasting energy by transforming some of it into heat)

How many points do you want to risk?

Describe this energy transfer using three forms of energy which are NOT potential or kinetic

Chemical to electrical to light/radiant (chemical in the battery, electrical in the wire, light in the light bulb)

And the winner is …