The document discusses the history and components of the electric bell. It describes how William Sturgeon invented the electromagnet in 1823, laying the foundation for future developments like Wagner's vibrating hammer and Marsh's oscillating electric wire. An electric bell works by using an electromagnet to attract an iron clapper that strikes a bell, producing a buzzing or clanging sound when electric current flows through the coils around iron rods in the electromagnet. Electric bells have applications as alarms for fires, burglars, and doors due to their low cost and ability to perform over 100,000 operations.

1. TEAM
ZERO GRAVITY
MD.SHAFIUZZAMAN
NURE ALAM NOBLE
SHAZID KARIM
SAMIM MIA
RAJIB MIA
AVIJIT SARKAR
KAMRAN AHMED
Course title: Electricity ,
Magnetism and Modern
physics
Course code: PHY 123
Course teacher: Subrata
Banik
Lecturer (Physics)
Department of General
education development
Daffodil International
University
Submited to:

2. TOPIC :ELECTRIC BELL

3. HISTORY OF ELECTRIC BELL
Invention of the
electromagnet by
William Sturgeon in
1823
Vibrating hammer
invented by Johann
Philipp Wagner (1839)
One of the first was
the oscillating
electric wire invented
by James Marsh in
1824.
Christian Ernst Neeff
(1847) was
developed into a
buzzer by Froment
(1847).
telegraph
developed by
Werner Siemens
around 1850
An inventer named Doug
Hugen invented the first
electric bell in 1930

5. WHAT IS ELECTRIC BELL?

6. ELECTRIC BELL
An electric bell is a mechanical bell that
functions by means of an electromagnet.
When an electric current is applied, it
produces a repetitive buzzing or
clanging sound. Electric bells have been
widely used at railroad crossings,
in telephones, fire alarms, etc.

7. WORKING
The Bell or gong ,which is often in
the shape of a cup or half sphere, is
struck by spring loaded arm with a
metal ball on the end called a
clapper ,actuated by an
electromagnet.
In its rest position the clapper is
held away from the bell at a short
distance to its springy arm(screw).

8. HOW IT WORKS?

9. ELECTRIC BELL ALL PARTS
BATTARY SWITCH
BELL
SPRING CONTACTS
SOFT IRON YOKESOFT IRON CORE SOFT IRON ARMATURE SCREW

10. PART AND WORK

11. HOW DOES THE BATTERY WORK

12. BATTERY WORK
An electric bell containsanelectromagnet, consistingofcoils
ofinsulatedwire woundroundiron rods.When anelectric
current flowsthrough the coils,the rods become magnetic and
attracta piece ofiron attachedto aclapper.The clapperhits
the bellandmakes itring.

13. Applications
They are used in fire
or burglar alarms.
It is used as alarms at some
industrial plants because it
is replaced by electronic
sounders.

14. It is used as a door bell.

15. ADVANTAGES
Low cost.
Less use of electricity.
Can perform for more than
100000 operations.

16. DISADVANTAGES
It performs only once for one push of
bell.
It can be destroyed when there is
sudden current loss.
In rainy season we can also get shock
from it if there is no earthing.