IN THE NAME OFIN THE NAME OF

ALLAHALLAHTHE MOST MERCIFUL THE MOST MERCIFUL

AND BENIFICIENTAND BENIFICIENT

GROUP NAMEGROUP NAME

MAAZ HUSSAINMAAZ HUSSAINBSEC-01093146BSEC-01093146

AREEB IQBALAREEB IQBALBEC-01091035BEC-01091035

RAMEEZ AHMAD MUGHALRAMEEZ AHMAD MUGHALBEC-01091032BEC-01091032

ZEESHAN ZEESHAN BSEC-01093119RBSEC-01093119R

TODAY’S TOPICTODAY’S TOPICGALVANOMETER

INTRODUCTION

PRINCIPLE

CONSTRUCTION

WORKING

APPLICATIONS

INTRODUCTIONINTRODUCTION

Galvanometer is an electromechanical Galvanometer is an electromechanical instrument which is used for the detection instrument which is used for the detection of electric currents     through electric of electric currents     through electric circuits. Being a sensitive instrument, circuits. Being a sensitive instrument, Galvanometer can not be used for the Galvanometer can not be used for the     measurement of heavy currents.     measurement of heavy currents. However we can measure very small However we can measure very small currents by using galvanometer but     the currents by using galvanometer but     the primary purpose of galvanometer is the primary purpose of galvanometer is the detection of electric current not the detection of electric current not the measurement of current.measurement of current.

WORKINGWORKINGPRINCIPLEPRINCIPLE

The Basic principle of Galvanometer is The Basic principle of Galvanometer is PMMC (permanent magnetic moving coil)PMMC (permanent magnetic moving coil)

Galvanometer works on the principle of Galvanometer works on the principle of conversion of electrical energy into conversion of electrical energy into mechanical energy. When a     current mechanical energy. When a     current flows in a magnetic field it experiences a flows in a magnetic field it experiences a magnetic torque. If it is free to rotate magnetic torque. If it is free to rotate under a     controlling torque, it rotates under a     controlling torque, it rotates through an angle proportional to the through an angle proportional to the current flowing through it.current flowing through it.

WORKINGWORKING

When a current passes through the When a current passes through the galvanometer coil, it experiences a magnetic galvanometer coil, it experiences a magnetic deflecting torque,     which tends to rotate it deflecting torque,     which tends to rotate it from its rest position. As the coil rotates it from its rest position. As the coil rotates it produces a twist in the suspension     strip. produces a twist in the suspension     strip. The twist in the strip produces an electric The twist in the strip produces an electric restoring torque. The coil rotates until the restoring torque. The coil rotates until the elastic     restoring torque due to the strip elastic     restoring torque due to the strip does not equal and cancels the deflecting does not equal and cancels the deflecting magnetic torque, then it     attains magnetic torque, then it     attains equilibrium and stops rotating any furthers.equilibrium and stops rotating any furthers.

CONSTRUCTIONCONSTRUCTION

APLLICATION APLLICATION SS

ANY ANY QUESTIONssssssss!!!!!QUESTIONssssssss!!!!!