Hdyhdd Flashcards
(71 cards)
1
Q
B1 - 10-24
A
2
Q
symbol
A
3
Q
7°=
A
4
Q
Table 14.1
A
5
Q
electric ci
A
6
Q
Electric
A
7
Q
Electric
A
8
Q
14
A
9
Q
Electric Current
A
10
Q
and its Effects
A
11
Q
ou might have tried the game
A
12
Q
‘How steady is your hand?’
A
13
Q
suggested in Chapter 12 of
A
14
Q
Class VI. If not
A
you may try it out now.
15
Q
Paheli and Boojho had also set up the
A
16
Q
game by connecting an electric circuit
A
17
Q
as suggested in Class VI. They had lots
A
18
Q
of fun trying it out with their families
A
19
Q
and friends. They enjoyed it so much
A
20
Q
that they decided to suggest it to a
A
21
Q
cousin of theirs who stayed in a
A
22
Q
different town. So
A
Paheli made a neat
23
Q
drawing showing how the various
A
24
Q
electric components were to be
A
25
connected (Fig. 14.1).
26
Fig. 14.1 Setup to check how steady
27
your hand is
28
Can you draw this circuit
29
conveniently? It made Boojho wonder if
30
there was an easier way to represent
31
these electric components.
32
14.1 SYMBOLS OF ELECTRIC
33
COMPONENTS
34
Some common electric components can
35
be represented by symbols. In Table 14.1
36
some electric components and their
37
symbols are shown. You may come
38
across different symbols for these
39
components in different books. However
40
in this book
we shall be using the
41
symbols shown here.
42
Look at the symbols carefully. In the
43
symbol for the electric cell
notice that
44
there is a longer line and a shorter but
45
thicker parallel line. Do you recall that
46
an electric cell has a positive terminal
47
and a negative terminal? In the symbol
48
of the electric cell
the longer line
49
represents the positive terminal and the
50
thicker
shorter line represents the
51
negative terminal.
52
For a switch the 'ON' position and
53
the 'OFF' position are represented by the
54
symbols as shown. The wires used to
55
connect the various components in a
56
circuit are represented by lines.
57
In Table 14.1
a battery and its
58
symbol are also shown. Do you know
59
what a battery is? Look at the symbol of
60
a battery. Can you make out what a
61
battery could be? For some of the
62
activities we may need more than one
63
cell. So
we connect two or more cells
64
together as shown in Fig. 14.2. Notice
65
Electri
66
Switc
67
Swi
68
that +
69
conn
70
next
71
- hor
