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Electric Current

Electric Current. What is an electric current?. To understand what an electric current is, we must first learn the structure of (1). What is an electric current?. atom.

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Electric Current

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  1. Electric Current

  2. What is an electric current? To understand what an electric current is, we must first learn the structure of (1). What is an electric current?

  3. atom

  4. Matter is made up of atoms. An atom consists of a (2) (+) and (3) (-). Sometimes electrons can escape from an atom and move freely with the conductor. These electrons are called (4) electrons. free electrons nucleus atom electrons

  5. A piece of copper wire contains many free electrons. When the wire is not connected to a dry cell, the free electrons move in different directions. free electrons moving in different directions atoms in the copper wire

  6. However, when the ends of the copper wire are connected to a dry cell, the free electrons move in the (5)direction. This flow of free electrons is called an electric current. flow of free electrons

  7. SUMMARY The electric current in a metal wire is a flow of . F(6)____ e (7)_____ Activity 8(c)

  8. Measuring electric current

  9. Ammeter (安培計)

  10. What is the unit of electric current?

  11. Ampere (安培) (A) Milliampere (mA)(毫安培)

  12. We use an (8) to measure the size of an electric current. The unit of electric current is (9). The symbol of the unit is (10). Small currents are measured in milliampere (mA). Experiment 8.4 Do you know? Do you know? Do you know? Activity 8(d)

  13. 1. atom 2. nucleus 3. electrons 4. free 5. same 6. free 7. electrons 8. ammeter 9. ampere 10. A Answers:

  14. Analogy of electric circuit

  15. The water pipe system

  16. Water pump Water pipe Flow of water Water turbine Tap Water The water pipe system:

  17. The electric circuit

  18. dry cell Connecting wire Light bulb Flow of free electrons Switch Free electrons The electric circuit:

  19. Analogy

  20. Water Water pipe Water turbine Tap Water pump Flow of water Free electrons Connecting wires Light bulb Switch Dry cell Flow of _____ _____ Analogy of electric circuitwith water pipe system

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