What is half deflection method in galvanometer?
What is half deflection method in galvanometer?
Half deflection method: The half deflection method is used to find out the resistance of a galvanometer. The galvanometer having resistance is connected with resistance R and battery B. The shunt resistance is connected in parallel with the galvanometer.
How do you do half deflection method?
1. By closing the key K2 and adjusting the value of resistance in resistance box RBOX 2, you get the deflection θ/2 in the galvanometer. Then the resistance S equals G, the resistance of galvanometer, because half of the current passing through R is shared by S and half by galvanometer.
What is half deflection method of finding the resistance in this experiment?
The half deflection method is the method by which an internal resistance of a cell can help in evaluating value which is considered as high. The deflection of half is considered as a value obtained along with the cell alone.
How do you calculate galvanometer deflection?
Obtain the formula, I = k θ for a moving coil galvanometer, given, the deflecting torque. where m is the magnetic dipole moment of the coil placed in the magnetic field B, I is the current in the galvanometer and θ is the deflection.
Why is the method to determine the resistance of galvanometer by half deflection method so called?
Why is this method called half deflection method? It is so because the deflection is made half by using a shunt resistance S. Under what condition id the resistance of a galvanometer (E1) equal to shunt resistance (S)? E1=S , only when series resistance R is very high .
What is the formula of shunt resistance?
Specifying a Shunt Resistor The resistance value is given by the voltage drop at the maximum current rating. For example, a shunt resistor rated with 100 A and 50 mV has a resistance of 50 / 100 = 0.5 mΩ.
What is the resistance of a galvanometer?
The initial resistance of the galvanometer is equal to 50 ohms. The maximum value of the current that can be passed through a galvanometer is 0.002 A. The range of the reading of the current that this ammeter should show is 0 – 0.5 A.
What is the formula for galvanometer?
Ig is calculated using the equation, Ig = nk, where n is the number of divisions on the galvanometer and k is the figure of merit of galvanometer.
What is the resistance of galvanometer?
Which method is used for determination of galvanometer resistance?
Kelvin’s method
Kelvin’s method is one of the most popular and easiest methods to determine the resistance of a galvanometer.
How do you solve shunt resistance?
A shunt is a high precision resistor that you can use to measure the current flowing through a circuit. According to Ohm’s law, you can calculate the resistance of a shunt resistor by dividing the voltage drop across the shunt by current flowing through it. Shunt resistors are marked with power rating.
How to determine resistance of galvanometer by half deflection method?
TO DETERMINE RESISTANCE OF GALVANOMETER BY HALF DEFLECTION METHOD AND TO FIND ITS FIGURE OF MERIT.
What is the figure of Merit of a galvanometer?
It is a device used for detecting feeble electric currents in circuit . Define the figure of merit of a galvanometer? The quantity of current required to produce a deflection of one division in the galvanometer is called figure of merit of a galvanometer . It is represented by K . Its unit is ampere per division .
How is a galvanometer used to detect low current?
Theory: Galvanometer is a sensitive device used to detect very low current. Its working is based on the principle that a coil placed in a uniform magnetic field experiences a torque when an electric current is set up in it.
How to calculate the merit of a resistance?
The figure of merit , K =E / [ (R+G)Q] (2) Where E is the end of the cell and Q is the deflection produced with resistance R. The maximum current that can pass through the galvanometer , I g =nk. Where n is the total number of dimension on the galvanometer scale on either side of zero .