1. Bellwork (2/18)  [ none this week – Happy Rodeo Break ]

2. Electric Circuits I 2/18/14

3. The Light Bulb  Conductors: - Filament - Internal Wire - Corkscrew Side - Base  Insulators: - Glass Globe - Insulating material (between side and base)

4. Conditions for a Circuit  There must be a closed conducting path that extends from the positive terminal to the negative terminal.  There must be an electric potential difference across the two ends of the circuit.

5. The Battery  A negative charge will gain potential energy and voltage as it moves from positive terminal to negative terminal in the battery

6. The Circuit  A negative charge will lose potential energy and voltage as it moves from negative terminal to positive terminal in the circuit

7. Battery and Circuit  A negative charge has the least amount potential energy at positive terminal  A negative charge has the greatest amount potential energy at negative terminal Voltage = Potential Difference High PE Low PE

8. Schematic Symbols Wires: Resistor (elec. device): Switch: Battery (Outlet): Fuse: Connected wires: Unconnected wires

9. In your notes define: Electric resistance - unit is ohms (Ω) Electric current - unit is amperes (A) Electric Power - unit is watts (W) Voltage source – “… dry cell, battery, outlet or generator, …” Circuit Series circuit Parallel circuit