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Understanding Electric Power Equation

Learn about the electric power equation, its importance in circuits, and how to calculate power. Includes practice problems and vocabulary squares.

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Understanding Electric Power Equation

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  1. DAILY QUESTION March 31, 2009 • What is the electric power equation?

  2. Agenda 3/31/09 • Daily Question • Finish Sect 3 Notes • Electric Power Practice Problems • Sect 3 Vocabulary Squares • Sect 3 Worksheet • Assignments: 1. All Worksheets due 4/1

  3. Electric Power • Electric power is the rate at which electrical energy is used in a circuit • Electric power is the product of total current (I) in and voltage (V) across a circuit Power (P) = current (I) x voltage (V) • SI unit for power is: watt (W)

  4. The unit of energy that electric companies use to track consumption of energy is the kilowatt-hour. • Electric meters are used to determine how much electrical energy is consumed over a certain time interval

  5. Overloaded Circuits • When electrical wires carry more than a safe level of current • May cause fires • Short circuits occur when two wires accidentally touch, creating an alternative pathway for current

  6. Fuses • Prevent overloading of circuits • A fuse is a ribbon of wire with a low melting point • A “blown out” fuse is a sign that a short circuit or a circuit overload may exist

  7. Circuit Breakers • Uses a magnet or bimetallic strip that responds to current overload by opening the circuit • Acts as a switch • Can be reset

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