What do you think n A light bulb

What do you think? n A light bulb is turned on. It produces light and warms up. Which statement is true? • A. All the electrical energy is transformed to light energy and heat energy. • B. All the electrical energy is transformed to light energy. • C. Some of the electrical energy is transformed to light energy and some is destroyed. • D. All the electrical energy is transformed to heat energy.

Energy Mrs. Smith

Exists in 2 States Energy - The ability to do work or cause change. Has several forms (or types) Kinetic -- Energy of Motion Potential - Stored Energy Can be Converted but not destroyed Law of Conservation of Energy Chemical Nuclear Electrical Heat Light Sound Can be Transformed or changed, but not created or destroyed.

Law of Conservation of energy n What is the law of conservation of energy? Energy can not be created or destroyed. It can only be transferred or transformed.

Energy Transformations

What does it mean to “transform” something?

What type of energy is this? n What is happening to the energy? Is it being created, Destroyed or transformed n n Chemical (battery) Electrical (wire) Light (light bulb)

n n n As energy moves through a system it can be transferred and/or transformed. Energy transformations involve the energy changing into a new form Example: the chemical in the battery is transformed into the electrical in the wire.

What happened to my energy? n n n Did my energy just disappear? Energy can be changed from one form to another. When energy changes form, the same amount of energy exists after the change as there was before the change

n For example, the chemical energy in a flashlight is transformed into electrical energy and then light energy

n Starting energy is transformed to final energy

Energy transformations n For example: • When you ate breakfast this morning what type of Energy were you consuming? Starting Energy Chemical • What type of Energy did you then use in order to leave your house (or the Cafeteria)? Kinetic Final Energy • So, the energy transformation was: • Chemical Kinetic

One more example: n This summer, my friends drove by several windmills on a trip out west (each windmill is about as tall as a 30 story building). They are used as an alternative energy source. What type of Energy transformation is taking place? Kinetic (Wind) Electrical

n Stretching a slingshot and shooting a water balloon Potential Kinetic

A. 2 step energy transfer n _______ (of the wind) Kinetic Energy ________ ( of the kite) Kinetic Energy

B. 3 step energy transfer _____ ( of the stove) Heat Energy ______ (of the pot) Heat Energy ______ ( of the water) n Heat Energy

A. 2 step energy transformation n _______ (of the lightning) Heat Energy Light Energy _______ and ______ (fire) Electrical Energy

B. 2 step energy transformation n Kinetic Energy _______ (of the skater) Potential Energy _______ (of the skater) B A

A. 2 step energy transformation ______ ( of the ball) Kinetic Energy ______( of the ball) n Potential Energy

B. 3 step energy transformation n Kinetic Energy _____ ( of the ball) Potential Energy ______ (of the ball) Kinetic Energy _____ (of the ball)

n Which baseball(s) have the most potential energy/ kinetic energy? B A C

A. 2 step energy transformation n _______ (of gasoline) Kinetic Energy _______ (of motion of car) Chemical Energy

B. 2 step Energy transformation n ______ (of food) Kinetic Energy ________ (of running) Chemical Energy

A. 2 step energy transformation n Light Energy _______ (of sun) Chemical Energy _______ (of crops)

B. 2 step Energy Transformation n _______ (movement of Light Energy electrons) ______ and Heat Energy ______ (of light bulb) Electrical Energy Electrons

Give one Get one A. 4 step Energy Transformation n Chemical Energy ______ (of battery) Electrical Energy ______ (of electrons) Light Energy _______ (of light bulb) Heat Energy _______ (of light bulb)

4 step energy transformation n Potential Energy _____ (of water) Kinetic Energy Electrical Energy _____ (of turbine) ____ (of generator)

5 step Energy transformation: Nuclear Power Plant Heat Energy _____ (of atoms) to _____ Energy (of water) to Kinetic ____ (of steam) to Kinetic Energy Electrical Energy ____ (of turbine) to _______ (of generator) n Nuclear Energy

4 step energy transformation Light Energy Chemical Energy Kinetic Energy