This document discusses electric current and its effects. It defines an electrochemical cell as a device that can produce electrical energy from chemical reactions, having two terminals - positive and negative. A battery is a combination of two or more electrochemical cells connected in series. Batteries and cells provide a potential difference (voltage) that allows electricity to flow through components in a circuit. Components can be connected in series, with the same current flowing through each one, or parallel, with multiple paths for current.

2. Electric Current And Its Effects
SUBJECT-SCIENCE
Class – 7th

3. OVERVIEW
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Electric components
Electrochemical cell (cell)
Battery
How electric current flows
Types of circuit
Used keywords:
Battery , Electric components ,Circuit diagram

4. What is required for these components
What is required for these components

5. Electricity

6. Can you tell how will electricity
reach to these components?

7. Battery
When we use it
Cell
When we use it

8. Battery or cell are required for it
Battery - because its required more electricity
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9. if we want more amount of electricity then we
use Battery
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10. When we want less amount of electricity then
we use cell, it has two terminal (+ve) and (-ve)
terminal .
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11. DEFINITION OF ELECTROCHEMICAL CELL
DEFINITION OF ELECTROCHEMICAL CELL
AND BATTERY
AND BATTERY
An electrochemical cell is a device capable of
either deriving electrical energy from chemical
reactions its have two terminal (+ve)and (–ve).
battery is combination of two or more
electrochemical cell in series .

12. Batteries!
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13. Electric Current:
• The flow of electric charges.
Higher Potential (+ ve)
Lower potential (- ve)

14. Battery (Chemical Cell):
• A device that converts chemical energy to
electricity.
• A battery provides a potential energy
difference (voltage source).
https://www.youtube.com/watch?
v=pgmoad7hvtc

15. Type of circuit

16. Serial circuit
• A Series Circuit is a circuit whose components are
connected in a single loop
• In a Series Circuit, the Current I flowing through each
component is the same but Voltage across each
component can be different.
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17. Parallel Circuit
• Resisters are connected in separate
branches
• There is more than one path for current
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18. ASSESSMENT QUESTION
QUES. See the picture below and give answers.
1. Would any of the bulb glow when the switch is in
the ‘OFF’ position ?
2. What will be the order in which the bulbs A,B and
C will glow when the switch in moved to the
‘ON’ position ?

20. Reference
• http://www.youtube.com/watch?
v=NVcvD3exIto
• NCERT Book