Why galvanometer is a sensitive device?

The most sensitive galvanometer is the spot ballistic galvanometer because it can measure very small deflections of current. Spot galvanometer is known as reflecting galvanometer. A spot galvanometer having a small mirror attached to the moving element. It measures extremely small currents.

What is galvanometer sensitive?

Sensitivity of galvanometer is defined as the current in micro ampere required to consume one millimeter deflection on a scale placed 1m away from the mirror. TO INCREASE SENSITIVITY OF GALVANOMETER.

Can galvanometer be converted into ammeter?

A galvanometer can detect only small currents. Thus, to measure large currents it is converted into an ammeter. It can be converted into an ammeter by connecting a low resistance called shunt resistance in parallel to the galvanometer.

Why can galvanometer measure current?

The galvanometer is a very sensitive device. For a small current of few microamperes, the galvanometer deflection will be maximum. The galvanometer resistance is larger than the ammeter, if it is connected in series it will reduce the current flow through the circuit.

Can A galvanometer be used for measuring the current explain?

No, a galvanometer as such can not be used for measuring current as it is a very sensitive instrument as it shos full scale deflection even for a very small current.

What is galvanometer current and current sensitivity?

Current sensitivity of galvanometer is the deflection caused in the coil of the galvanometer per unit flow of electric current through it. k is the restoring torque per unit twist of the suspension string.

How can we increase current sensitivity of galvanometer?

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.

How does a galvanometer deflect?

When the magnet is moved away from the coil, the galvanometer shows deflection in the opposite direction indicating the direction of induced current in the reversed direction. The direction of deflection in a galvanometer is reversed if the direction of motion (or polarity of the magnet) is reversed.

What is current sensitivity of galvanometer how it can be increase?

Sensitivity of a moving coil galvanometer can be increased by increasing the number of turns in the coil, the area of coil and magnetic field whereas by decreasing the couple per unit twist of the suspension.

How a galvanometer can be converted to ammeter and voltmeter?

A galvanometer can be converted into ammeter by connecting a low resistance called shunt in parallel to the galvanometer. A galvanometer can be converted into voltmeter by connecting a high resistance called multiplier in series to the galvanometer. An ohmmeter is an arrangement which used for measuring resistance.

How do you know if a galvanometer is sensitive?

If a galvanometer gives a bigger deflection for a little current it is said to be sensitive. The current in Moving Coil galvanometer is: I = (C/nBA) × θ

What is the maximum deflection current in the galvanometer?

The maximum deflection current in the galvanometer is 100μA. Find the current in the circuit, so that the ammeter shows maximum deflection. (IIT-JEE|2005) I= (1+R G / R S ).

How do you use a galvanometer to measure voltage?

The galvanometer can be used to measure: a) the value of current in the circuit by connecting it in parallel to low resistance. b) the voltage by connecting it in series with high resistance. A galvanometer is converted into an ammeter by connecting it in parallel with a low resistance called shunt resistance.

How do you find the shunt resistance of a galvanometer?

When current I G passes through the galvanometer, the current through the shunt resistance is given by I S = I – I G. The voltages across the galvanometer and shunt resistance are equal due to the parallel nature of their connection. Therefore R G.I G = (I- I G).R s The value of S can be obtained using the above equation.