Electric bell

for presentation

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

4. WHAT IS ELECTRIC BELL?

5. 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.

6. 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).

7. HOW IT WORKS?

8. ELECTRIC BELL ALL PARTS BATTARY SWITCH BELL SPRING CONTACTS SOFT IRON YOKE SOFT IRON CORE SOFT IRON ARMATURE SCREW

9. PART AND WORK

10. HOW DOES THE BATTERY WORK

11. BATTERY WORK A n electric bell contains an electromagnet , consisting of coils of insulated wire wound round iron rods . When an electric current flows through the coils , the rods become magnetic and attract a piece of iron attached to a clapper . The clapper hits the bell and makes it ring.

12. 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.

13. It is used as a door bell .

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

15. 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 .