Showing 37–48 of 124 results

  • 4Me2 Magnetic Force – Magnetic Force Model

    The formation of magnetic force

    Like poles repulse each other and unlike poles attract each other.  Magnetic force is formed under the magnetic field.

     

    The concept of magnetic force

    In a magnetic…

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  • 4Me3 Magnetic levitation – Magnetic levitation model

    The concept of magnetic levitation
    Magnetic levitation makes use of its repulsive force between like poles of two magnets.

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  • 4Me4 Magnetic Electromagnet– Electromagnetic model

    The concept of electromagnet
    When electric current passes through the metal wire, it magnetizes the wire temporarily and produces a magnetic field. An electromagnet is formed. It stops…

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  • 4Me5 Magnetic Motor – Electric Motor Model

    The concept of electric motor
    The basic mechanism of an electric motor and an electric generator is almost the same except its concept. An electric generator is an electrical…

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  • 5Ec1電能發光 – 電燈

    電燈的發光原理:
    電燈是利用電流(電能)把燈絲加熱到白熾狀態而用來發光
    (光能)的燈。只有7~8%的電能變成可見光,90%以上的電能轉化成了熱,電燈的發光效率很低,然而,它卻是電燈世界的開路先鋒。現代的電燈一般壽命為1000小時左右。電燈是根據電產生熱的原理製成的。現在的燈泡一般都選用鎢絲做燈絲。

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  • 5Ec2動能發電 – 動能發電模型

    動能發電的基本原理:

    發電機的主要結構分為定子和轉子。定子是由矽鋼片及線圈所構成,包裏着中間的轉子。轉子主要是由一個圓形的永久磁鐵構成。

    當外力使發電機中的轉子轉動,永久磁鐵的磁力不斷被定子的線圈攔截而轉換成電動勢,輸出電壓,而達到發電的目的。

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  • 5Ec3太陽能發電 – 太陽能風扇模型

    太陽能發電的基本原理:
    我們可以使用太陽能電池板把陽光直接轉換成電力。跟據光電效應,光線照射在導體或半導體上時會造成電流。
    而光的波長越短,頻率越高,反之亦然。

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  • 5Ec4太陽能動力 – 太陽能車

    太陽能動力的基本原理:

    太陽能動力是指將太陽能轉移成動力的一個過程。在之前的單元中,我們知道電能和光能是可以互換的。

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  • 5Ec5能量循環 – 能量轉移模型

    能量轉移的基本原理:

    能量的形式可以概分為兩大類:動能和『位能』。所有能量形式都是動能、位能、或是兩者的結合。能量的種類繁多,如熱能、電能、磁能、彈性能和光能等。

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  • 5Ee1 Electric Light- Electric Light Bulb

    What is the concept?
    An electric lamp is a device that produces visible light by the flow of electric current. An incandescent lamp produces light by a filament heated…

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  • 5Ee2 Kinetic to Electric Energy – Model Electric Generator

    The concept of electric generator
    The main structure of the electric generator is divided into stator and rotor. Stator is made of silicon steel sheet and coil and the…

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  • 5Ee3 Solar to Electric Energy – Solar Fan

    We can use solar panels to convert sunlight directly into electricity. Based on the photoelectric effect, when conductors or semiconductors are exposed to the light, electric current is…

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