Switches control the flow of electricity in electrical circuits. They allow circuits to be opened and closed, interrupting or completing the path for current to flow. Different types of switches are used for different purposes - light switches are commonly mounted on walls to control room lighting, but bathroom light switches are often placed in ceilings for safety reasons. Appliances like refrigerators and video recorders contain multiple internal switches to control their various functions. Switches open and close circuits, allowing electricity to power devices when needed but preventing power drain when devices are not in use.

1. 4Fb Switches
•What are switches?
•What is the function of switches?
•How to make a switch?
Circuits
Grade 4– Spring 2020
The City School
Raffia
Lecture –Switches
Jun-10-20

2. Starter Questions
• How we can save light with the help of
switches?
• How many types of switches can you can see
around?

3. Light switches
• These switches help us save electricity,
because we can switch off the light when it
not in use.
• Most light switches are fastened to the wall,
but in the bathroom, the switch is usually in
the ceiling for saftey.
• By pulling the cord its turned off and on.

4. How does a light switch in the fridge
works?
• The lightbulb is operated by a small
lever switch or push-button switch mounted
in the door of the refrigerator. When
depressed by the door closing on it,
the switch interrupts the circuit and shuts the
lightbulb off; when the door opens,
the switch completes the circuit and causes
the light to illuminate.

5. how many switched would video
recorder have?
• A video recorder has a lot of different circuits
inside it.
• Some circuits make the video play, some make
the fast forward
• Each circuit has its own switch and so on.
• The swiches control what video recorder does.

6. Electric circuits
• Switch
– A switch controls the flow of the electric current in
a circuit.
– A circuit can have one or more switches.
a light switch

7. Switches
When aswitch is open (off),
there is agapin the circuit.
Electricity cannot travel around
the circuit.
When aswitch is closed (on), it
makes the circuit complete.
Electricity can travel around the
circuit.

8. Closed and open circuits
• A switch controls whether the circuit is
complete or not.
• When a switch is open, there is a break in the
circuit and the current does not flow through
the circuit.
• Thus, a switch can be used to open or close a
circuit.

9. Closed and open circuits
switch is open
bulb does not light up

10. Closed and open circuits
switch is closed
bulb lights up

11. Questions Page76- Exploring Science
1. Why do we need light switches insider
refrigerators?
2. How do you think the switch works?
3. Why do you think bathroom light switches
are in ceiling?
4. Why does a video recorder have lots of
switches?
5. Write down the names of some other things
that have lots of switches on them?

12. 4Fb Switches
•What are switches?
•What is the function of switches?
•How to make a switch?
Circuits
Grade 6– Spring 2020
The City School
Raffia
Lecture –Switches
Jun-10-20

17. battery
batteryMains
Mains

18. Home work