Electric Current And Its Effects

SUBJECT-SCIENCEClass – 7th

• Electric components

• Electrochemical cell (cell)

• Battery

• How electric current flows

• Types of circuit

Used keywords:

Battery , Electric components ,Circuit diagram

OVERVIEW

What is required for these components to work ? What is required for these components to work ?

Electricity

Can you tell how will electricity reach to these components?

Battery When we use it

CellWhen we use it

Battery or cell are required for it

Battery - because its required more electricityNext

if we want more amount of electricity then we use Battery

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When we want less amount of electricity then we use cell, it has two terminal (+ve) and (-ve) terminal .

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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 .

DEFINITION OF ELECTROCHEMICAL CELL AND BATTERY DEFINITION OF ELECTROCHEMICAL CELL AND BATTERY

Batteries!

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Electric Current:• The flow of electric charges.

Lower potential (- ve)

Higher Potential (+ ve)

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

Type of 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.

Serial circuit

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• Resisters are connected in separate branches

• There is more than one path for current

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Parallel Circuit

ASSESSMENT QUESTIONQUES. 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 ?

Reference

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