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Vocabulary Returns

Vocabulary Returns . Agenda: Welcome Back Pretest Vocabulary Activity. Today is Vocabulary Day. E&M Vocabulary a 24 hour vocabulary activity due on Tuesday. Electrostatics. Electrostatics is the study of electric charges that can be collected and held in one place. Coulomb’s Law.

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Vocabulary Returns

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  1. Vocabulary Returns Agenda: Welcome Back Pretest Vocabulary Activity

  2. Today is Vocabulary Day • E&M Vocabulary a 24 hour vocabulary activity due on Tuesday.

  3. Electrostatics • Electrostatics is the study of electric charges that can be collected and held in one place.

  4. Coulomb’s Law • Coulomb discovered that charges exert forces on other charges at a distance and that a force is stronger when the charges are closer together. • The SI standard unit of charge is called the coulomb (C). • The charge on a single electron is 1.60×10−19 C. The magnitude of the charge of a single electron is called the elementary charge. There is no charge less than this and all charges are multiples of this number.

  5. Vocabulary • A material that allows charges to move about easily is called an electric conductor. • Most metals, salt water, and acidic solutions are good conductors. • A material through which a charge will not move easily is called an electric insulator. • Glass, dry wood, most plastics, cloth, and dry air are all good insulators and poor conductors.

  6. Electroscope • An electroscope consists of a metal knob connected by a metal stem to two thin, lightweight pieces of metal foil, called leaves.

  7. Current, Power and Resistance • The rate of flow of electric charge, called electric current, is measured in amperes, A. • Power, which is measured in watts, W, measures the rate at which energy is transferred. • The property determining how much current will flow is called resistance. The resistance of the conductor, R, is measured in ohms (Ω)

  8. Electric potential difference • Electric potential difference, ΔV, is the change in potential energy from one place to another. Sometimes, the electric potential difference is simply called the voltage because it is measured in the unit of volts (V). • The term volt (and voltage) comes from the name of the inventor of the battery, Alessandro Volta, an Italian physicist

  9. Formulas P = IV V=IR ( Power) (Ohm’s Law) • P = power • I = current • V = potential difference • R = resistance

  10. Series Circuit • A circuit in which all current travels through each device, is called a series circuit.

  11. Parallel Circuit • A circuit in which there are several current paths is called a parallel circuit.

  12. Electromagnetism • Electromagnetism describes the relationship between electricity and magnetism • Electromagnetism works on the principle that an electric current through a wire generates a magnetic field

  13. Electromagnets • This magnetic field is the same force that makes metal objects stick to permanent magnets. • In a bar magnet, the magnetic field runs from the north to the south pole. • In a wire, the magnetic field forms around the wire. If we wrap that wire around a metal object, we can often magnetize that object. In this way, we can create an electromagnet.

  14. AC vs DC • Electricity flows in two ways; either in alternating current (AC) or in direct current (DC). • Therefore, the difference between AC and DC has to do with the direction in which the electrons flow. • In DC, the electrons flow steadily in a single direction, or "forward." • In AC, electrons keep switching directions, sometimes going "forward" and then going "backward.”

  15. Transformers • A transformer is a device for changing electrical energy. It transfers electrical energy from one alternating circuit to another with a change in voltage, current, phase, or impedance.

  16. Now The Choice is Yours: • Pick one of the three activities to review your vocabulary. • Quiz Wednesday • Crossword Puzzle • Vocabulary Sleuth. Typed No Errors • Vocabinoes

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