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    Lecture : Electricity

    Apr 25, 2026 • 2:44 PM

    1 Tag
    Stop
    Format

    0:00 / 0:45

    Electric Current and Circuit

    An electric current is the flow of electric charge through a conductor.

    A torch uses cells (or a battery) to provide the flow of charge.

    "The direction of electric current is conventionally taken as opposite to the direction of the flow of electrons."

    I =
    Qt

    I : Current

    Q : Net charge

    t : Time

    The SI unit of electric charge is coulomb (C).

    The SI unit of electric current is ampere (A).

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    Lecture : Electricity

    Apr 25, 2026 • 4:19 PM

    1 Tag
    Record
    Format

    Key Learning points

    Resistors in Series – Total resistance equals the sum of individual resistances.

    Resistors in Parallel – Reciprocal of total resistance equals the sum of reciprocals of individual resistances.

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    Quick Check: Electricity

    1/2

    Which of the following is the SI unit of electric current?

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