PPT: Electric Current and Its Effects | Science Class 7 (Old NCERT) PDF Download

 Page 1


Electric
Current &
its effects
Page 2


Electric
Current &
its effects
Electric Circuit
DIRECTION OF
ELECTRIC CURRENT
It is a complete path
through which electric
current flows.
It should be
constructed in an
unbroken loop.
Page 3


Electric
Current &
its effects
Electric Circuit
DIRECTION OF
ELECTRIC CURRENT
It is a complete path
through which electric
current flows.
It should be
constructed in an
unbroken loop.
What makes an electric
circuit complete?
A simple circuit consists of a battery
(or other source), a light bulb (or other
load) and conducting wires.
C O M P O N E N T
S Y M B O L
Page 4


Electric
Current &
its effects
Electric Circuit
DIRECTION OF
ELECTRIC CURRENT
It is a complete path
through which electric
current flows.
It should be
constructed in an
unbroken loop.
What makes an electric
circuit complete?
A simple circuit consists of a battery
(or other source), a light bulb (or other
load) and conducting wires.
C O M P O N E N T
S Y M B O L
Other Circuit
Components
Shown below are other circuit
components and their corresponding
electrical symbols:
battery closed switch open switch
resistor motor fuse
Page 5


Electric
Current &
its effects
Electric Circuit
DIRECTION OF
ELECTRIC CURRENT
It is a complete path
through which electric
current flows.
It should be
constructed in an
unbroken loop.
What makes an electric
circuit complete?
A simple circuit consists of a battery
(or other source), a light bulb (or other
load) and conducting wires.
C O M P O N E N T
S Y M B O L
Other Circuit
Components
Shown below are other circuit
components and their corresponding
electrical symbols:
battery closed switch open switch
resistor motor fuse
When these electrons pass through
a load or a receiver, electrical
energy can change into other forms,
such as light, heat and sound.
A dry cell provides the ‘push’ needed
for electrons to flow in the loop.
These electrons are already present
in the wires.
What happens
in a circuit?