SF027 1 UNIT 5: Electric Current and UNIT 5: Electric Current and Direct Direct- Current Circuit (D.C.) Current Circuit (D.C.) SF027 2 Consider a simple closed circuit consists of wires, a battery and a lamp as shown in figure 5.1a. From the figure, Direction of electric field or electric current : Positive to negative Positive to negative terminal. terminal. Direction of electron flows : Negative to positive terminal. Negative to positive terminal. The electron accelerates because of the electric force acted on it. Definitio n – is defined as the total (net) charge, Q flowing through the total (net) charge, Q flowing through the area per unit time, t. the area per unit time, t. Mathematically, Fig. 5.1a Fig. 5.1a 5.1 Electric Current, IArea, A e Fr Er ItQ I= dtdQ I= orInstantaneous Instantaneous current current
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