1. Series and Parallel Circuits

2. Two Important Terms Battery - Energy source (produces electricity) Switch - Device that controls whether or not electric current flows through a circuit

3. Different Types of Circuits Complete Circuit - Current flows in a complete circle. Flows from battery, to bulb, back to battery Incomplete Circuit - Path of electricity flow has been broken. - Electricity stops and bulb will not light

4. Continued Closed Circuit - Complete circuit, but a switch is used to close the circuit - Current goes from battery, through the switch, through the lights and back to the battery Open Circuit - Switch is open so circuit is incomplete = no light!

5. Draw a Circle On the circle, draw a battery On the opposite side, draw a bulb Which way is electricity flowing? - From negative to positive

6. Series and Parallel Circuits Series Circuit - Current travels along a single path to two or more electric devices (batteries, bulbs, switches) Parallel Circuit - Current travels along two or more paths to different electric devices.

7. Series Circuits “When one goes, they all go!” - ex: Flashlights, old Christmas lights All operate on the same current - More lights->Bulbs get “dimmer” - Series = All in one row ->Train

8. Parallel Circuits Current “splits” - Has more than one way to go around Commonly used in homes

9. What We Have Learned Thus Far!!! http://www.youtube.com/watch?v=D2mon VkCkX4&feature=fvwhttp://www.youtube.com/watch?v=D2mon VkCkX4&feature=fvw

10. A Few Questions… When an electric appliance is running, is the circuit that the appliance is part of open or closed? Why is it usually better to use a parallel circuit? When you flip a light switch on the wall, what does it do?