Access Prior Knowledge Lesson 2: What are simple circuits? Opening Activity Open Science textbook to page 482. Open Science folder to review vocabulary words and outline for the chapter. Open Science journal and answer the following questions: 1- Name some simple machines and how they work. Review Content Cards and Q-Cards in bin, sharing with partners quizzing each other quietly. Log in to clickers using student ID number. Be ready to review home learning when timer goes off. Don't forget to write your home learning in your agenda page 151A.

Do you agree with the statement? Simple circuits have a source of energy, a conductor, a resistor, and a switch. YES NO

Do you agree with the statement? Even if a circuit is broken, charges will still flow through it. YES NO

Do you agree with the statement? A switch controls the flow of charges. YES NO

Do you agree with the statement? Series circuits can only have one resistor on the same wire. YES NO

Parts of a Circuit A circuit moves electrical energy from one place to another in a looped path and has a source of energy and a conductor. A battery can provide the energy to move electric charges through a circuit and is made of chemicals that can make a current. -The current leaves the negative end of the battery and moves to the positive end of the battery. A circuit can have more than one conductor and makes an unbroken path in the circuit. An insulator keeps the electric charges inside the pathway. -Charges will not flow in a broken circuit. A circuit can also have a switch that opens or closes a gap in the circuit. -Closing the gap lets the electric charges flow. -Opening the gap stops the current. Most circuits also have resistors, which transform energy to electrical energy into sound, light, thermal, or mechanical energy. -A light bulb is a resistor because it changes electrical energy into light energy. -A buzzer is another resistor because it changes electrical energy into sound energy.

Circuit Diagrams People use circuit diagrams to help build circuits and the lines on a circuit diagram show how electricity moves through the circuit. -The symbols on a circuit diagram show different parts of the circuit. -For example, the symbol for a wire looks like a line and the symbol for a resistor is an uneven line. The volt is a measure of the electrical energy a source makes. Ohms measure the amount of resistance to an electrical current. The current in the circuit is measured in amperes, also called amps. -Current is measured by how much charge moves past a certain spot each second.

Series Circuit A circuit with more than one resistor in a single loop is called a series circuit.

TextQuest Answer questions in your Science Journal 1. Name four common parts of a circuit. 2. Describe the purpose of a resistor in a circuit. 3. If the switch is left open, what will happen to the current? Don't forget to write your home learning in your agenda page 151A.