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CHAPTER12 Electricity - NCERT

Electricity12 CHAPTERE lectricity has an important place in modern society. It is a controllableand convenient form of energy for a variety of uses in homes, schools,hospitals, industries and so on. What constitutes Electricity ? How doesit flow in an electric circuit ? What are the factors that control or regulatethe current through an electric circuit ? In this Chapter, we shall attemptto answer such questions. We shall also discuss the heating effect ofelectric current and its ELECTRIC CURRENT AND ELECTRIC CURRENT AND ELECTRIC CURRENT AND ELECTRIC CURRENT AND ELECTRIC CURRENT AND CIRCUITWe are familiar with air current and water current. We know that flowingwater constitute water current in rivers. Similarly, if the electric chargeflows through a conductor (for example, through a metallic wire), wesay that there is an electric current in the conductor.

Electricity 203 Table 12.1 Symbols of some commonly used components in circuit diagrams Sl. Components Symbols No. 1 An electric cell 2 A battery or a combination of cells 3 Plug key or switch (open) 4 Plug key or switch (closed) 5 A wire joint 6 Wires crossing without joining 7 Electric bulb or 8 A resistor of resistance R

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