Figure of merit is the amount of current been passed in the unit of deflection in a galvanometer. Its SI unit is Ampere per division .
What is the unit of galvanometer?
What is the SI unit of the merit of the galvanometer? The Ampere unit is its SI unit.
How is figure of merit calculated?
Figure of merit of the galvanometer :
Record the observations in a tabular column. Repeat the experiment by changing the value of R and note the galvanometer deflection each time. We can find the figure of merit of the galvanometer by using the equation, k= E/(R+G)θ.
Which quantity is the reciprocal of figure of merit?
Figure of merit of a galvanometer is the reciprocal of current sensitivity . Galvanometer has positive and negative terminals. Galvanometer deflection is proportional to the amount of current passed through it.
What is the unit of current sensitivity?
The SI unit of the current sensitivity is radian per ampere .
What is figure of merit in physics?
Figure of merit is in general is the numerical value representing the degree of effectiveness or efficiency of an instrument approximated by different estimation techniques . The figure of merit of a galvanometer is the current required to produce a deflection of one division in the galvanometer scale.
What is Theta in figure of merit?
placed in a radial magnetic field, the coil experiences a deflection. θ which is related to I as. I = k θ where k is a constant of proportionality and is termed as figure of merit of the galvanometer.
What is current unit?
The SI unit of current is ampere which measures the flow of electric charge across a surface at the rate of one coulomb per second. Since the charge is measured in coulombs and time in seconds, so the unit is coulomb/Sec (C/s) or amp.
What is the unit of voltmeter?
Voltmeter, instrument that measures voltages of either direct or alternating electric current on a scale usually graduated in volts , millivolts (0.001 volt), or kilovolts (1,000 volts).
What is the SI unit of voltmeter?
The SI unit of the potential difference is Volt and the SI unit of the distance is meter. We need a physical quantity that has its SI unit as Volt-meter. Flux is the physical quantity which has SI unit Voltmeter.
What is voltage sensitivity?
Voltage sensitivity is the measure of the responsiveness of an appliance to the transform of applied voltage across it . A galvanometer is a type of ammeter. It is an appliance for detecting and measuring electric current.
What is difference between galvanometer and ammeter?
| Parameter Ammeter Galvanometer | Nature of Current It measures both direct and alternating current. It measures only direct current. |
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How many types of galvanometer are there?
Some of the different types of galvanometer include Tangent galvanometer, Astatic galvanometer, Mirror galvanometer and Ballistic galvanometer . However, today the main type of galvanometer type that is used widely is the D’Arsonval/Weston type or the moving coil type.
What is sensitivity and its SI unit?
Ratio of deflection produced in the galvanometer and the current flowing through it is called current sensitivity. Si=Iθ SI unit of current sensitivity Si is division/ampere or radian /ampere .
How is sensitivity measured?
Sensitivity is an absolute quantity, the smallest absolute amount of change that can be detected by a measurement . ... This means that at 1 volt the equivalent measurement is 1000 units or 1 mV equals one unit. However the sensitivity is 1.9 mV p-p so it will take two units before the input detects a change.
How can the current sensitivity increases?
So, sensitivity of the galvanometer can be increased either by increasing the number of turns (N) , using strong magnets or increasing the area of the coil (A). So, the correct answer is that the sensitivity of a moving coil galvanometer can be increased by increasing the number of turns of the coil.
