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Lecture : Electricity

Apr 25, 2026 • 2:44 PM

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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 =

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

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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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