Today’s Agenda… Work from yesterday Bellringer/Quiz – You need a clean sheet of paper numbered 1-5 Review Notes on Electrical Energy

Question #1 What happens to the particles in a substance as it is heated? A. They slow down B. They speed up C. They stop moving D. They lose energy

Question #2 Which of the following is a true statements about heat transfer? A. Heat ALWAYS flows from warmer to cooler objects B. Heat ALWAYS flows from cooler to warmer objects C. Heat NEVER travels in a similar pattern D. Heat does not move

Question #3 What happens to an object that loses heat? A. It cools down B. It warms up C. It stays the same temperature D. It disappears

Question #4 What type of heat transfer occurs when you burn your tongue on hot soup? A. conduction B. convection C. radiation D. reflection

Question #5 When you hold your hand over a hot burner without touching it, the heat can still travel to your hand through _____. A. conduction B. convection C. radiation D. reflection

Review from Wednesday How do we know that energy is involved in chemical reactions? What are the two types of chemical reactions? Why is baking a cake an endothermic reaction? Why is burning wood an exothermic reaction?

Electrical Energy Study Pack #8

Today’s Goals… I can explain how electrical energy is transferred in a circuit. I can describe how an electric current flows.

What is an electrical current? The flow of electrical charges The flow of electrons along a wire

Unit for Current The amount of electrical current in a wire is the amount of charge that flows into and out of the wire every second The unit for current is the ampere, A 1 ampere of electric current means about six billion billion electrons flowing into and out of the wire every second

A Simple Electric Current Electric energy can be transformed into heat, light, and sound energy To watch tv energy must be constantly transformed The electric current must be kept flowing

A Simple Electric Current Electric current will flow continually in a CLOSED path called an electrical circuit A circuit includes: Wire Energy source A receiver (light, fan, motor) A switch (not required)

A Simple Electric Current Current flows as long as the switch is closed When the switch is open, current no longer flows If one of the wires are cut or the light bulb is unscrewed the current will not flow

Conductors and Insulators Conductors allow electrons to move through them (metals) Insulators do not allow electrons to move through them (plastic, rubber) The wires are usually made of metal wrapped with plastic

Making Electric Charges Flow A force must be exerted on electric charges to make them flow Force is exerted on an electric charge by an electric field There is an electric field in the circuit that will move electrons in a single direction

Making Electric Charges Flow A battery can produce an electric field Chemical reactions cause the negative end to become more negative and the positive end to become more positive Electrons flow from the negative end to the positive end

Exit Slip On a post-it note list the following: One thing you learned from the lesson today One question you still have about the lesson today Put it on the bulletin board when the bell rings