WELCOME

NAME: RAGINI. P OPTION: PHYSICAL

SCIENCE

St. JACOB’S TRAINING COLLEGE, MENANKULAM

ELECTRICITY

EIECTRICITY PLAYS A VERY IMPORTANT ROLE IN OUR DAILY LIFE . IT IS A FORM OF ENERGY THAT HELPS US IN MANY WAYS. MOST OF THE COMFORTS OF MODERN LIFE WOULD NOT BE THERE, IF THERE IS NO ELECTRICITY.

THE ELECTRICITY THAT WE USE IN OUR HOUSES, SCHOOLS & FACTORIES IS OBTAINED THROUGH POWER STATIONS . WE GET A SMALL AMOUNT OF ELECTRICITY THROUGH BATTERIES & CELLS.

THE ELECTRIC POWER THUS PRODUCED IS USED THROUGH CIRCUITS & CONTROLLED BY SWITCHES.

INTRODUCTION

FLOW OF CURRENT REQUIRES A CLOSED CODUCTING PATH. THIS PATH MADE BY CONNECTING A CELL OR A BATTERY, A SWITCH & A BULB BY MEANS OF WIRES. THIS CLOSED CONDUCTING PATH IS KNOWN AS AN ELECTRIC CIRCUIT.

CIRCUIT

SIMPLE CIRCUITSSERIES CIRCUITSPARALLEL CIRCUITS

TREE KINDS OF CIRCUITS

A CIRCUIT MADE UP OF A CELL , A SWITCH & A BULB IS KNOWN AS A SIMPLE CIRCUIT.

WHEN THE SWITCH IS PUT ON, THE BULB GLOWS . THIS IS BECAUSE THERE IS A CONTINUOUS OR CLOSED PATH FOR THE ELECTRIC CURRENT FLOW.

SIMPLE CIRCUIT

THE FIRST CIRCUIT AS DESCRIBED ABOVE IS GIVEN HERE . WHEN YOU LOOK AT THE CIRCUIT , IT IS OBVIOUS THAT THE BULBS ARE CONNECTED END TO END . THIS TYPE OF CIRCUIT IS KNOWN AS SERIES CIRCUIT . HERE THE CURRENT CAN FLOW ONLY IN ONE DIRECTION & THE SAME AMOUNT OF ELECTRIC CURRENT FLOWS THROUGH ALL THE BULBS .

WHAT HAPPENS WHEN ONE OF THE BULBS IN THE CIRCUIT IS REMOVED OR FUSES OFF ? THE OTHER BULBS WILL NOT GLOW BECAUSE THE CIRCUIT IS NOT COMPLETE NOW .

SERIES CIRCUIT

BSERVE THE SECOND CIRCUIT. HERE EACH BULB IS CONNECTED TO THE BATTERY TERMINALS BY SEPARATE WIRES. THIS TYPE OF CIRCUIT IS KNOWN AS PARALLEL CIRCUIT . IN THIS CIRCUIT DIFFERENT AMOUNT OF CURRENT PASSES THROUGH THE BULBS.

WHAT HAPPENS WHEN ONE OF THE BULBS IN THE CIRCUIT IS RRMOVED OR FUSES OFF ? THE OTHER BULBS WILL GLOW BECAUSE THEY HAVE SEPARATE CONDUCTING PATHS.

PARALLEL CIRCUIT

THANK YOU