OBJ: Given notes, activity sheet SWBAT explain voltage, resistance and four factors that affect resistance with 70% accuracy. DN: Watch Electricity.

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Presentation transcript:

OBJ: Given notes, activity sheet SWBAT explain voltage, resistance and four factors that affect resistance with 70% accuracy. DN: Watch Electricity Video ACT: Introduction to voltage, voltage sources, resistance and factors affecting resistance iPad (eSpark) Textbook, read p. 44-51; Complete Electric Current Booklet (HW check tomorrow) HW: Text, read p. 44-51; Complete Electric Current Booklet; Work on Quarter 2 Study Guide; Interim Exam, Jan 22.

Lesson Notes Conductors: materials that allow electrons to flow (move). Examples: metals, water, acids Insulators: materials that do not allow electrons to flow. Examples: rubber, glass, rock, plastic, wood, fabric, ceramic, paper.

Conductors Metals Water Acids

Insulators Rubber Rubber Tires Plastic Glass Glass Ceramic

Lesson Notes Voltage (Volt, V): “difference in electrical potential energy between two places in a circuit”. Example: roller coaster High Potential Energy electron difference Voltage Low Potential Energy

Lesson Notes Voltage: total amount of pushing force by electrons (electric current). Voltage Sources: device that creates a potential energy difference in a circuit. Example: battery, generator, solar cell

Lesson Notes Factors Affecting Resistance: Resistance (ohm, Ω): measure of how difficult it is for electrons to flow through a material. More resistance ~ less current (amps) Less resistance ~ more current (amps) Factors Affecting Resistance: Material of the wire (conductors vs. insulators) Wire Length (see transparancy) Wire Diameter Wire Temperature

Factors Affecting Resistance