How can a moving coil galvanometer be used to measure electrical potential difference?

A voltmeter is an instrument used to measure electrical potential differences in volts. In order to convert a moving coil galvanometer into a voltmeter, a resistor of high resistance is connected in series with the coil of the galvanometer. A current Ic through the galvanometer coil produces full-scale deflection.

How current is measured in a moving coil galvanometer?

Under the action of this torque, the coil rotates and the deflection in the coil in a moving coil galvanometer is directly proportional to the current flowing through the coil. It must admit the current to be measured through it. This is possible only when it is in series in the circuit.

How galvanometer can be used to measure current?

A galvanometer works by deflecting a pointer in response to an electric current flowing through a coil in a constant magnetic field. Galvanometers can be thought of as a kind of actuator. They were the first instruments used to detect and measure small amounts of current.

Is a moving coil galvanometer used to measure EMF?

Moving coil galvanometer is an electromagnetic device that can measure small values of current. It consists of permanent horseshoe magnets, coil, soft iron core, pivoted spring, non-metallic frame, scale, and pointer.

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 do we use to measure resistance?

Resistance is measured using an instrument such as an analog multimeter or digital multimeter. As a result, a circuit’s resistance value can be determined if the current and voltage measured values are known. Analog multimeters and digital multimeters employ the measurement principle of Ohm’s Law to measure resistance.

What is the use of a moving coil galvanometer?

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.

Why can galvanometer measure AC current?

Ordinary galvanometers cannot be used for the measurement of an current (AC), because the alternation of the current would produce deflection in both directions. An of the galvanometer, however, called an electrodynamometer, can be used to measure alternating currents by means of electromagnetic deflection.

Why can a galvanometer not be used as such to measure current in a given circuit write two reasons?

(b) A galvanometer cannot be used to measure the value of the current because of following two reasons: (i) Galvanometer is a very sensitive device, it shows large deflection when small currents pass through it. (ii) Galvanometer has very high resistance which can alter the value of current flowing in circuit.

What is moving coil galvanometer used for a measurement of voltage only?

Explanation: Moving Coil Galvanometer is an instrument used for the detection and measurement of current. It is sensitive instrument and can measure current even if it is only a few microamperes. It was invented by Johann Schweigger in the 1800s.

What is moving coil galvanometer used for measurement of voltage only?

What is the working principle of a moving coil galvanometer?

A moving coil galvanometer is an easy and sensitive instrument to detect and measure electric current. The moving coil galvanometer working principle is based upon the fact that when electric current flows in a coil placed in a magnetic field, a deflecting torque acts upon the coil whose magnitude depends upon the strength of the current.

How do you use a moving coil to measure voltage?

You can use moving-coil meters to measure voltage, current, or resistance—but you have to connect them up in different ways in each case. To measure voltage, you connect a meter in parallel across the two points of the circuit you want to measure. Voltage-measuring meters are called, not surprisingly, voltmeters.

How do you find the sensitivity of a galvanometer?

The Sensitivity of Moving Coil Galvanometer The sensitivity of a Moving Coil Galvanometer is the ratio of the change in deflection of the galvanometer to the change in current. Therefore we write, Sensitivity = dθ/di. If a galvanometer gives a larger deflection for a small current it is a sensitive galvanometer.

How does torque affect deflection in a galvanometer?

Torque acts on a current-carrying coil suspended in the uniform magnetic field. Due to this, the coil rotates. Hence, the deflection in the coil of a moving coil galvanometer is directly proportional to the current flowing in the coil. [source: Redefining The Knowledge]