Humdingers+(Circuits)

**Language Objective:** We will share information in cooperative learning interactions.
 * Content Objective:** We will demonstrate that the flow of electricity in circuits requires a complete path through which an electric current can pass.

**SCIENCE LAB**

**ENGAGE:** 2 minutes

**EXPLORE: 10** minutes **EXPLAIN** -- 10 minutes **ELABORATE**: 30 minutes
 * What are the rules in the science lab?
 * Who thinks they know what a circuit is? Tell a neighbor.
 * Who can identify a circuit in this classroom? (lights)
 * Think: Do you think the circuit is open or closed? Pair.
 * Raise your hand if you think the circuit is open. Raise your hand if you think the circuit is closed.
 * Pass out bags of humdinger supplies. Tell groups they have 35 seconds to construct a simple circuit.
 * Hold up one closed circuit from a group.
 * Is the motor on or off?
 * Is the circuit open or closed?
 * What happens to the electricity when a circuit is closed?
 * (Open the circuit)
 * What happens to the electricity if a circuit is opened?
 * __REVIEW:__
 * __conductor__ -- object that allows energy to flow through it
 * __insulator__ -- object that does not allow energy to flow through it
 * __POWER TEACH:__
 * __energy__ -- the ability to do work (One S handshape taps the back of the other S handshape to represent the hands doing something) or cause change (The hands change position with each other)
 * __circuit__ -- complete path (hands moving in parallel zigzags through the air) that an electric current (knuckles of index fingers hit together, then the pinky traces a zaggy line from one index finger) moves through
 * an open circuit does not allow electricity to flow through
 * a closed circuit does allow electricity to flow through

Students will observe a device obscured from view in the front of the classroom. The only part of the device that is visible is a string that comes through a hole in the board. When pulled, the string causes the device to create first a humming noise, then a 'ding'.

**EVALUATE:** Make sure all students are working cooperatively in groups together; students should display an understanding of conductors, insulators, and circuits as they try to build their devices.
 * We will engage in a Think Win-Win activity today. Your team will win (get an A) if you can do the following things:
 * Use all or some of the materials on their tables to build a device that uses a switch to open and close a circuit,
 * "hums" first and "dings" second, and
 * use synergy in their group effort..

**Homework:** List four circuits you can find in your house.