Can someone please explain how a galvanometer works?

Question

I have a physics exam tomorrow and I have to explain this as an essay question. I need to know a lot of details. Thanks!

Answer 1

A galvanometer consists of a coil of wire mounted in a magnetic field created by a parmanent magnet. The coil is suspended by jeweled bearings and springs, and a current through it will cause it to twist the springs. A needle or other indicator can show the deflection on a scale. The term galvanometer is seldom used now; the devices are simply called meters, and can be made more specifically to show voltage (many turns of fine wire) or current (fewer turns of coarser wire).

Answer 2

Skin Galvanometer

Answer 3

A. Three points to remember:

(1) A galvanometer is a type of ammeter, an instrument for
detecting and measuring electric current.

(2) It is an electromechanical transducer that produces a rotary deflection, through a limited arc, in response to electric current flowing through its coil.

(3) The name galvanometer has been applied to devices used in measuring, recording, and positioning equipment.

B. How It works?

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

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Answer 4

he measurement of sweat, which is scientifically known as the measurement of galvanic skin resistance, is conducted by a two-piece galvanometer attached to two of the subject's fingertips (Bonsor). The galvanometer works by sending a small electric current into the skin from one of the fingerplates and records how much current was allowed to pass through on the other fingerplate. Dry skin is not a very good conductor of electricity. If a subject perspires, however, the water and salt from the sweat reduces the resistance of the skin. This decrease in resistance allows a larger amount of electric current to travel along the surface of the skin. Therefore, the amount of electric current recorded by the galvanometer reflects the amount of sweat that was produced in the subject's fingertips.

Answer 5

It's a coil of wire suspended with extremely low friction and connected to a spring with extremely low spring constant. It is placed so its magnetic field axis is 45 degrees off the axis of a strong permanent magnetic field, and free to rotate in that direction. Pass a current through that coil, and the magnetic field exerts a force on the coil, causing it to rotate in the direction which would align the magnetic field axes. It is an extremely sensitive detector of very small currents, and is generally used in a bridge circuit. It shows exactly zero current (zero deflection) when the bridge circuit is perfectly matched.

Answer 6

Galvonometer :
First remove all the packing and place on an even surface making sure all the extra parts are included . If anything is missing do not continue . Then press button A and stand behind something furry . Once gas C has cleared the area F attatch the hose making sure both lines are parallel and synchronised . Repeat seven times . After use place back in box and store somewhere clammy . Do NOT use in a field .
I hope this helps .

Answer 7

galvanometer is a device which use for the ditection of small current

Answer 8

it is a moving coil suspended in a fixed permanent magnet assembly. when current flows thro it one way, it will create a torque and hence a deflection on the needle in one direction, and the other way when current flows in the opposite direction in the coil.