Why is the resistance of the galvanometer small?

Since ‘S’ is small major portion of the current flows through it and a small portion of current flows through G. So shunt protects the galvanometer from high currents. Parallel resistance is smaller than Galvanometer resistance because to protect the Galvanometer from high (large) current (or) to pass.

Does a galvanometer have resistance?

Galvanometer has small resistance. The construction of the galvanometer is same as that of the ammeter but the only difference between an ammeter and a galvanometer is that the ammeter has additional resistance connected in parallel with the circuit.

Is resistance of galvanometer high or low?

In reality, the galvanometer has a very low resistance of 100 ohms.

Should the resistance of galvanometer be low or high give reason?

The resistance of an ammeter should be low. An ammeter has to be connected in series with the circuit to measure current. In case, its resistance is not very low, its inclusion in the circuit will reduce the current to be measured. In fact, an ideal ammeter is one which has zero resistance.

Why galvanometer is always connected in series?

The galvanometer uses a moving coil which is free to rotate between the permanent magnet. When the current flows through the coil, it becomes deflected. It is connected in series with the circuit for determining the exact value of circuit current.

What is resistance of the galvanometer?

the galvanometer resistance equals that value of the variable resistance in the two methods. which gives the same second deflection. A new method which resembles the Kelvin method of. obtaining the resistance of a galvanometer is reported.

What type of resistance is to be added with a galvanometer?

Since Galvanometer is a very sensitive instrument therefore it can’t measure heavy currents. In order to convert a Galvanometer into an Ammeter, a very low resistance known as “shunt” resistance is connected in parallel to Galvanometer.

Why high resistance is used in galvanometer?

We can construct ammeters using a galvanometer by attaching a high resistance in parallel to the galvanometer. The parallel combination ensures that all current flows through the galvanometer while the high resistance doesn’t allow current to pass through itself.

Why should the Milliammeter have low resistance?

Since, milliammeter is more sensitive, the resistance is lower in milliammeter. For a constant voltage , the current through a milliammeter must be lower (in the order of milliamperes) but the current through a ammeter would be higher (in the order of amperes) thus the resistance in milliammeter will be higher.

Should the resistance be low or high?

Answer: The resistance of an ammeter should be low. An ammeter has to be connected in series with the circuit to measure current. In case, its resistance is not very low, its inclusion in the circuit will reduce the current to be measured.

What is the resistance of a galvanometer?

Galvanometers have quite low resistance usually in the range of a few ohms to a few tens of ohms. The resistance comes from a long length of thin wire made into a coil. The magnetic field produced by the coil is what makes the galvanometer work.

How to make a deflection in galvanometer?

Second option is putting a parallel resistance (shunt) with very small value so that most of the current flows through it and only a tiny portion of current will flow through galvanometer (as current always have a tendency to flow in less resistant path like you mentioned) which is sufficient to make the deflection.

What is the working principle of moving coil galvanometer?

The angle through which the coil is deflected due to the effect of the magnetic torque is proportional to the magnitude of current in the coil. The moving coil galvanometer is made up of a rectangular coil that has many turns and it is usually made of thinly insulated or fine copper wire that is wounded on a metallic frame.

What is the difference between ammeter and galvanometer?

Key is in knowing when to use which instrument: Galvanometer has a lower accuracy but a much higher sensitivity than ammeter. Also, galvanometer tells you the direction of current as well. If you want to measure a current then use ammeter. If you want to know if there is a current and which way its flowing then use galvanometer.