Table of Contents
How does a moving coil galvanometer work?
A moving coil galvanometer works on the principle that a current-carrying coil placed in a magnetic field, experiences a torque. The coil springs along with the radial field ensure the deflection to be proportional to the strength of the current.
What is the formula for moving coil galvanometer?
I = (C / nBA) × θ where C is the torsional constant of the spring; i.e. the restoring torque per unit twist. A pointer attached to the spring indicates the deflection θ on the scale.
What is current sensitivity?
Current sensitivity of galvanometer is the deflection caused in the coil of the galvanometer per unit flow of electric current through it. Current sensitivity = θ/I = NBA/k. Here, B is the strength of the magnetic field in which the coil is suspended. A is the area of the coil.
What is sensitivity of galvanometer?
The current sensitivity of a galvanometer is the deflection per unit current produced by the galvanometer. A high-sensitivity galvanometer can be used to measure very low values of currents. A low-sensitivity galvanometer can be used to measure high values of currents.
How is current measured in galvanometer?
Current in a circuit can be measured by placing a galvanometer in the circuit. The current passes through the galvanometer, deflecting the pointer and giving the current in amps.
What is K in galvanometer?
Here k is called the torsional constant of the spring (restoring couple per unit twist). The deflection or twist θ is measured as the value indicated on a scale by a pointer which is connected to the suspension wire. θ= ( nAB / k)I. Therefore θ ∝ I. The quantity nAB / k is a constant for a given galvanometer.
What is SI unit of galvanometer?
The SI unit of current sensitivity of galvanometer is division/ampere (or) radian/ampere.
What is SI unit of current sensitivity?
SI unit of current sensitivity Si is division/ampere or radian /ampere.
Who invented galvanometer?
Johann Schweigger
The earliest form of the electromagnetic galvanometer was devised in 1820 by Johann Schweigger (1779–1857) at the University of Halle in Germany.