How do you convert a moving coil galvanometer into an ammeter?

A galvanometer can be converted into an ammeter by connecting a low resistance (called shunt) in parallel to galvanometer value of shunt is so adjusted that most of the current passes through the shunt. In this way a galvanometer is converted into ammeter and can measure heavy currents without fully deflected.

What is pivoted coil galvanometer?

Construction: The construction of a pivoted type galvanometer consists of a rectangular coil of thin insulated copper wire wound on an aluminium frame rotating freely on a vertical axle between the cylindrical pole pieces of a permanent horseshoe magnet. The axle is pivoted at the two ends on jewelled bearings.

How does a galvanometer work as an ammeter?

A galvanometer can be turned into an ammeter by parallely connecting a resistance in the electric circuit. It can be used as a voltmeter when resistance is connected in series with it. Ammeter is used to measure the magnitude of current. It is also called as ampere meter because ampere is the unit of current.

How can we convert galvanometer into ammeter and voltmeter?

1 Answer

  1. A galvanometer is converted into a voltmeter by connecting a high resistance ‘R’ in series with it.
  2. A galvanometer is converted into an ammeter by connecting a small resistance (called shunt) in parallel with it.
  3. Resistance of voltmeter, RV = G + R.

How will you convert a moving coil into an ammeter reading?

A moving coil galvanometer is converted into an ammeter reading upto 0.03 A by connecting a shunt of resistance 4r across it and into an ammeter reading upto 0.06 A when a shunt of resistance r connected across it.

How a moving coil is converted into an ammeter?

Solution : A moving-coil galvanometer can be converted into an ammeter by reducing its effective resistance by connecting a parallel low resistance S across the coil. Such a parallel low resistance is called a shunt since it shunts a part of the current around the coil.

What is moving coil galvanometer used for?

A moving coil galvanometer is an instrument which is used to measure electric currents. It is a sensitive electromagnetic device, which can measure low currents even of the order of a few microamperes.

What is the meaning of pivot in physics?

a pin, point, or short shaft on the end of which something rests and turns, or upon and about which something rotates or oscillates. the end of a shaft or arbor, resting and turning in a bearing.

Why is galvanometer not used directly as ammeter?

For a small current of few microamperes, the galvanometer deflection will be maximum. 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.

What information you should have when galvanometer is converted into ammeter?

Solution : Before converting the galvanometer into an ammeter or voltmeter we require the following two informations. (i) The resistance of galvanometer and (ii) the current for full scale deflection of galvanometer.

How do you convert galvanometer into ammeter Class 12?

It can be converted into an ammeter by connecting a low resistance called shunt resistance in parallel to the galvanometer. Ig is calculated using the equation, Ig = nk, where n is the number of divisions on the galvanometer and k is the figure of merit of galvanometer.

How can a moving coil galvanometer be converted into an ammeter write expression of resistance required?

A moving coil galvanometer can be converted into an ammeter by connecting a low resistance (called a shunt) in parallel to the galvanometer. A moving coil galvanometer can be converted into a voltmeter by connecting a high resistance in series with the galvanometer.