PPT - Electric Current and Its effects Notes | Study Science Class 7 - Class 7

Class 7: PPT - Electric Current and Its effects Notes | Study Science Class 7 - Class 7

The document PPT - Electric Current and Its effects Notes | Study Science Class 7 - Class 7 is a part of the Class 7 Course Science Class 7.
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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
Nail
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