Table of Contents
- 1 Why galvanometer is not used to measure current in a circuit?
- 2 How does galvanometer measure current?
- 3 Why a galvanometer Cannot be used as such to measure high order current in a given circuit give correct reason?
- 4 Why is galvanometer not used directly as ammeter Mcq?
- 5 How do galvanometers work?
- 6 Why does galvanometer show half value?
Why galvanometer is not used to measure current in a circuit?
The galvanometer is a very sensitive device. Hence, it may get damaged when a strong current is passed through the galvanometer. The galvanometer resistance is larger than the ammeter, if it is connected in series it will reduce the current flow through the circuit.
How does galvanometer measure current?
galvanometer, instrument for measuring a small electrical current or a function of the current by deflection of a moving coil. The magnetic field produced by a current passing through the coil reacts with the magnetic field of the permanent magnet, producing a torque, or twisting force. …
Why only half deflection method is preferred?
The method that comes to our mind first is by Ohm’s Law. But this method gives some inaccuracy because ideal ammeter must posses zero resistance and voltmeter with infinite resistance. But no devices are idea. Hence we prefer to use half deflection method to measure the unknown resistance value..
Why a galvanometer Cannot be used as such to measure high order current in a given circuit give correct reason?
The two reasons why a galvanometer cannot be used for measuring current are: The high resistance of galvanometer can disturb the original current flowing through the circuit. The high current present in the circuit can destroy the coil windings present in the galvanometer.
Why is galvanometer not used directly as ammeter Mcq?
The device used to measure the electric current is called as an Ammeter. Ammeter is always connected in series with the circuit which increases the resistance of the circuit. This small value of current cannot be measured by MCG, so to avoid this resistance of galvanometer should be low. …
Can galvanometer measure direction of current?
Yes, the galvanometer shows the direction of current. When the current flows through the solenoid, there is a deflection in the galvanometer towards the left.
How do galvanometers 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.
Why does galvanometer show half value?
The quantity of current required to produce a deflection of one division in the galvanometer is called figure of merit of a galvanometer . Its unit is ampere per division . Why is this method called half deflection method? It is so because the deflection is made half by using a shunt resistance S.
Why the resistance of galvanometer is kept small?
Such low resistance galvanometer ( ammeter) is used in series with the circuit to measure the strength of current through the circuit. A low resistance may not introduce any change in the value of current to be measured.