Page 1 CHAPTER - 14 Electric current and its effects Page 2 CHAPTER - 14 Electric current and its effects 1) Symbols of electric components :- Electric component Symbol i) Electric cell ii) Electric bulb iii) Switch in OFF position iv) Switch in ON position v) Battery vi) Wire Page 3 CHAPTER - 14 Electric current and its effects 1) Symbols of electric components :- Electric component Symbol i) Electric cell ii) Electric bulb iii) Switch in OFF position iv) Switch in ON position v) Battery vi) Wire Electric cell :- has a positive terminal and a negative terminal. The symbol of an electric cell has a longer line and a shorter line. The longer line is the positive terminal and the shorter line is the negative terminal. Battery :- A battery is a combination of two or more cells. In a battery the positive terminal of one cell is connected to the negative terminal of another cell. Devices like torches, transistors, toys, TV remote controls use batteries. Connecting cells together Cell holder Page 4 CHAPTER - 14 Electric current and its effects 1) Symbols of electric components :- Electric component Symbol i) Electric cell ii) Electric bulb iii) Switch in OFF position iv) Switch in ON position v) Battery vi) Wire Electric cell :- has a positive terminal and a negative terminal. The symbol of an electric cell has a longer line and a shorter line. The longer line is the positive terminal and the shorter line is the negative terminal. Battery :- A battery is a combination of two or more cells. In a battery the positive terminal of one cell is connected to the negative terminal of another cell. Devices like torches, transistors, toys, TV remote controls use batteries. Connecting cells together Cell holder 2) A simple electric circuit :- A simple electric circuit can be made by using a cell, electric bulb, switch and wires. The bulb glows only when the switch is in the ON position and the circuit is closed. Closed electric circuit Open electric circuit An electric circuit Page 5 CHAPTER - 14 Electric current and its effects 1) Symbols of electric components :- Electric component Symbol i) Electric cell ii) Electric bulb iii) Switch in OFF position iv) Switch in ON position v) Battery vi) Wire Electric cell :- has a positive terminal and a negative terminal. The symbol of an electric cell has a longer line and a shorter line. The longer line is the positive terminal and the shorter line is the negative terminal. Battery :- A battery is a combination of two or more cells. In a battery the positive terminal of one cell is connected to the negative terminal of another cell. Devices like torches, transistors, toys, TV remote controls use batteries. Connecting cells together Cell holder 2) A simple electric circuit :- A simple electric circuit can be made by using a cell, electric bulb, switch and wires. The bulb glows only when the switch is in the ON position and the circuit is closed. Closed electric circuit Open electric circuit An electric circuit 3) Heating effect of electric current :- When electric current flows through a wire, the wire gets heated. This is called the heating effect of electric current. Activity :- Make an electric circuit as shown in the figure. Take a 10 cm long nichrome wire and tie it between the two nails. Switch on the current. After a few seconds touch the wire. The wire feels hot. Then switch off the current. After a few seconds touch the wire again. It does not feel hot. This shows that when electric current flows through a wire, it gets heated. Nichrome wire NailRead More
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