Transcription of Electric circuits, Current, and resistance (Chapter 22 and 23)
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Electric circuits, Current, and resistance (Chapter 22 and 23)
Dr. Mangala Singh, 1P22/92 brock UniversityElectric circuits, Current, and resistance (Chapter 22 and 23)Acknowledgements: Several Images and excerpts are taken from College Physics: A strategic approach, Pearson Education IncDr. Mangala Singh, 1P22/92 brock UniversityDr. Mangala Singh, 1P22/92 brock UniversityCurrentQIt = If Electric charge ( electron) moves, we will say an Electric current, I, is set to exist. An Electric current, I, is the rate at which net charge ( Q)flows through a surface area ACurrent s units = C/S and often written as A (Ampere)Although current carriers ( , charges) could be + or - , the direction of current will be in the direction of a + charge flow ( ,clockwise)AI+Electrons are actual current carriers in metals. They flow opposite to the direction of Electric field or currentDr. Mangala Singh, 1P22/92 brock UniversityCurrent and Current densityn = number of mobile charges per unit volumeq = charge on each current carriers x = distance they move in a time interval tvd= speed (called drift velocity )J = current density Drift velocity vd?
Dr. Mangala Singh, 1P22/92 Brock University Current Q I t ∆ = ∆ If electric charge (e.g. electron) moves, we will say an electric current, I, is set to exist. An electric current, I, is the rate at which net charge (∆Q) flows through a surface area A Current’s units = C/S and often written as A (Ampere) Although current carriers (i.e ...
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