38. A simple switch can be made by using a small sheet of thermocol, two drawing pins, a safety pin and two pieces of wire.Make a sketch of this switch when it is:
I)in 'off' position
ii) in 'on' position
Answers
Answer:
Science NCERT Grade 6, Chapter 9, Electricity and Circuits begins with an introduction of uses of electricity and its importance. The first section of the chapter focuses on the concept of an electric cell in addition to a diagram indicating two terminals of a cell. This section of the chapter, Electricity and Circuits explains the structure of a cell in detail, in addition to its various uses. The term filament is also defined here.
The second section demonstrates the working of an electric cell through an activity. Furthermore, different arrangements of electric cell and bulb are shown in figures. In the third section, the concept of current is explained with the help of figure. The direction of flow of current is indicated in a similar figure. The fourth section discusses the definition and working of an electric switch. The above section is also supplemented with activities and figure and ends up with a definition of a switch. The last section of the chapter, Electricity and Circuits lays emphasis on electric conductors and insulators. It deals in detail with their definition and examples. It also provides a difference between conductors and insulators and their examples as well.
The entire chapter discusses precautionary methods required while working with electricity.
The topics covered in the chapter, Electricity and Circuits are Electric Cell, A Bulb Connected to an Electric Cell, An Electric Current, Electric Switch and Electric Conductors and Insulators.
Page No 123:
Question 1:
Fill in the blanks:
(a) A device that is used to break an electric circuit is called a ______ __.
(b) An electric cell has ______ __ terminals.
ANSWER:
(a) A device that is used to break an electric circuit is called a __switch__.
Switch:
A switch is an electric device that is used to break a circuit. When the switch is in ‘OFF’ position, then the circuit is not complete. Then, the circuit is called an open circuit. An electric current cannot flow through this circuit.
(b) An electric cell has __two__ terminals.
Two terminals:
An electric cell has two terminals, a negative terminal and a positive terminal (as shown in the given figure).
Explanation:
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