Electric bell

1. ELECTRIC BELLELECTRIC BELL

2. INTRODUCTIONINTRODUCTION
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.

3. HOW IT HOW IT
WORKS?WORKS?

4. WORKING 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).

5. ApplicationsApplications
They are used in fire or burglar alarms.
It is used as alarms at some industrial
plants because it is replaced by
electronic sounders.
It is used as a door bell.

6. ADVANTAGES ADVANTAGES
Low cost.
Less use of electricity.
Can perform for more than 100000
operations.

7. DISADVANTAGESDISADVANTAGES
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.

8. COSTCOST
BED BELL CLASSIC SWITCH: 60-
500/-
BELL PUSH SWITCH:70-500/-
DING DONG DOOR BELL: 70-1000/-

9. RATING OR RATING OR
SPECIFICATIONSSPECIFICATIONS
ELECTRIC BELL OPERATES ON ONLY
LOW VOLTAGE HENCE THERE
RATING SHOULD BE 10 VOLTS TO 24
VOLTS.

10. A PRESENTATION BY:
SANTA KRISHANA SANTA KRISHANA
DURBHADURBHA