ELECTRICAL ENGINEERING

 NEW IDEA

QUESTION

HOW THAT  WHEN FUSE WIRE BLOWN OUT AND YOU CHECK AND REPLACE FUSE WIRE QUICKLY WITHOUT STRRUGLE AND CHECKING OTHER HOME APPLIANCES AND WASTAGE OF PRECIOUS TIME?.

ANSWER:-

• WHEN YOU INSTALL A FUSE IN A CIRCUIT, THE BOTH TERMINALS OF FUSE CONNECTED ON PHASE EACH TERMINAL. 

• INSTALL AN ADDITIONAL LAMP IN A CIRCUIT WITH LAMP HOLDER.

• CONNECT THE BOTH SIDES OF THE LAMP HOLDER TO THE BOTH PHASE TERMINALS OF THE FUSE.

•   GIVE SUPPLY TO THIS CIRCUIT.

•   WHEN THE FUSE WIRE HEALTHY, THE LAMP WILL SHOW "OFF" STATE.

•  WHENEVER THE FUSE WIRE BLOWN OUT, AND THE FUSE ON ABNORMAL STATE.AT THIS TIME WHEN YOU SWITCH "ON" ANY HOME APPLIANCES. THE LAMP WILL SHOW "ON" STATE. AND ALSO SHOW THAT THE OTHER CIRCUIT IS HEALTHY ,ONLY THE FUSE WIRE BLOWN OUT.

PLEASE TRY IT.

POWER DISTRIBUTION SYSTEM

DO YOU KNOW THAT IN 3 PHASE- 4WIRE SYSTEM, IF THE VOLTAGE PER PHASE IS 220 VOLTS THEN MATHEMATICALLY MAKE 660 VOLTS (i.e 220 X3 =660 VOLTS ), BUT WE MEASURES IT 440 VOLTS INSTEAD OF 660 VOLTS ?

ANS:- WE KNOW THAT IN 3 PHASE POWER SYSTEM, WHEN WE DRAW SINOSOIDAL WAVE FORMS  OF ALL THE THREE PHASES, IT SHOWS THAT AT ANY INSTANT 1ST PHASE ON +VE PEAK, 2ND PHASE ON -VE PEAK AND 3RD PHASE ON NEUTRAL POSITION. AND THIS POSITION CHANGE ON EVERY INSTANT. SO IF WE ASSUME FOR A INSTANT THAT THE 1ST PHASE ON 220 VOLTS ( +VE SIDE ) AND 2ND PHASE ON 220 VOLTS (-VE SIDE ) ( 220+220 = 440 ) AND THE 3RD PHASE WILL BE ON NEUTRAL POSITION. 

PLEASE SEE AND UNDERSTAND IMAGES BELOW

8051 microcontroller

8051 microcontroller widely used now a days in various electronics equipments.