PPT: Electricity: Circuits and their Components | PPTs for Class 7 PDF Download

 Page 1


Electricity: 
Circuits and 
their 
Components
Page 2


Electricity: 
Circuits and 
their 
Components
Introduction to Electricity
What is Electricity?
Electricity is a form of energy 
resulting from the movement 
of charged particles like 
electrons. It powers our 
homes, schools, and 
everyday devices.
Sources of Electricity
In India, we generate 
electricity from various 
sources like thermal power 
plants, hydroelectric dams 
like Bhakra Nangal, solar 
panels, and wind turbines.
Uses in Daily Life
From lighting our homes to charging mobile phones, electricity 
has become essential in our daily lives. This chapter will explore 
how electricity works.
Page 3


Electricity: 
Circuits and 
their 
Components
Introduction to Electricity
What is Electricity?
Electricity is a form of energy 
resulting from the movement 
of charged particles like 
electrons. It powers our 
homes, schools, and 
everyday devices.
Sources of Electricity
In India, we generate 
electricity from various 
sources like thermal power 
plants, hydroelectric dams 
like Bhakra Nangal, solar 
panels, and wind turbines.
Uses in Daily Life
From lighting our homes to charging mobile phones, electricity 
has become essential in our daily lives. This chapter will explore 
how electricity works.
A Torchlight
What is a Torchlight?
A portable device that produces light, commonly 
used to see in the dark.
Components:
Lamp: Produces light when turned on
Switch: Controls on/off function
Electric Cells: Provide energy for the lamp
How It Works
The switch connects cells to the lamp when "on," 
allowing electricity to flow. When "off," the 
connection breaks.
Page 4


Electricity: 
Circuits and 
their 
Components
Introduction to Electricity
What is Electricity?
Electricity is a form of energy 
resulting from the movement 
of charged particles like 
electrons. It powers our 
homes, schools, and 
everyday devices.
Sources of Electricity
In India, we generate 
electricity from various 
sources like thermal power 
plants, hydroelectric dams 
like Bhakra Nangal, solar 
panels, and wind turbines.
Uses in Daily Life
From lighting our homes to charging mobile phones, electricity 
has become essential in our daily lives. This chapter will explore 
how electricity works.
A Torchlight
What is a Torchlight?
A portable device that produces light, commonly 
used to see in the dark.
Components:
Lamp: Produces light when turned on
Switch: Controls on/off function
Electric Cells: Provide energy for the lamp
How It Works
The switch connects cells to the lamp when "on," 
allowing electricity to flow. When "off," the 
connection breaks.
A Simple Electrical Circuit
Electrical Circuit
A complete path allowing electric 
current to flow from a power source 
through a device and back.
Components
Circuits contain wires (conductors), a 
power source, and electrical devices like 
bulbs or motors.
Current Flow
Electric current flows from the positive 
terminal, through the circuit 
components, and back to the negative 
terminal.
Page 5


Electricity: 
Circuits and 
their 
Components
Introduction to Electricity
What is Electricity?
Electricity is a form of energy 
resulting from the movement 
of charged particles like 
electrons. It powers our 
homes, schools, and 
everyday devices.
Sources of Electricity
In India, we generate 
electricity from various 
sources like thermal power 
plants, hydroelectric dams 
like Bhakra Nangal, solar 
panels, and wind turbines.
Uses in Daily Life
From lighting our homes to charging mobile phones, electricity 
has become essential in our daily lives. This chapter will explore 
how electricity works.
A Torchlight
What is a Torchlight?
A portable device that produces light, commonly 
used to see in the dark.
Components:
Lamp: Produces light when turned on
Switch: Controls on/off function
Electric Cells: Provide energy for the lamp
How It Works
The switch connects cells to the lamp when "on," 
allowing electricity to flow. When "off," the 
connection breaks.
A Simple Electrical Circuit
Electrical Circuit
A complete path allowing electric 
current to flow from a power source 
through a device and back.
Components
Circuits contain wires (conductors), a 
power source, and electrical devices like 
bulbs or motors.
Current Flow
Electric current flows from the positive 
terminal, through the circuit 
components, and back to the negative 
terminal.
Electric Cell
All electric cells have two terminals; one is 
called positive (+ ve) while the other is 
negative (3 ve). 
The metal cap is the positive terminal of the 
electric cell and the metal disc is the negative 
terminal. 
The electric cell is a portable source of 
electrical energy.