![]() Then, calculate the amount of charge, current, and power generated by the lightning. From the lightning, consider that 10 9 J energy moves to the potential difference of 5 × 10 7 V by taking a time-interval of 0.2 s. From scientific experiments, lightning is the most powerful natural current. Some solved examples from the current electricity IIT JEE notes are given below. R = Electrical resistance of a conductor = ρ * l / A R = The electrical resistance of the conductor.Įlectrical resistance is a kind of obstacle provided by any conductor in the track of the flow of current. Ohm’s law is another important topic that is discussed below in the current electricity notes for JEE Main.Īt constant temperature, the electric current ‘I’ passing through a conductor is directly proportional to the potential difference V induced across its ends. unit of current density = ampere metre -2. For example, an AC dynamo operates on alternating current.Ĭurrent density can be defined as the electric current flowing through per unit area of the cross-section of a wire. For example, cells, batteries, or DC dynamos operate on direct current.Īlternating Current can be explained as the current whose value fluctuates incessantly and there is a periodical fluctuation of its direction. In direct current, the magnitude and direction of current do not alter with time. The electric current can be classified into the following two types. Some important current electricity JEE notes are given below. ![]()
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