## Electrodynamometer Wattmeter

Definition: The instrument whose working depends on the reaction between the magnetic field of moving and fixed coils is known as the Electrodynamo-meter Wattmeter. It uses for measuring the power of both the AC and DC circuits. The working principle of the Electrodynamometer Wattmeter is very simple and easy. Their working depends on the theory …

## Ballistic Galvanometer

Definition: The galvanometer which is used for estimating the quantity of charge flow through it is called the ballistic galvanometer. The working principle of the ballistic galvanometer is very simple. It depends on the deflection of the coil which is directly proportional to the charge passes through it. The galvanometer measures the majority of the charge …

## Voltmeter

Definition: The instrument which measures the voltage or potential difference in volts is known as the voltmeter. It works on the principle that the torque is generated by the current which induces because of measurand voltage and this torque deflects the pointer of the instrument. The deflection of the pointer is directly proportional to the …

## Ammeter Shunt

Definition: The ammeter shunt is the device which provides the low resistance path to the flow of current. It connects in parallel with the ammeter. In some of the ammeter, the shunt is inbuilt inside the instrument while in others it is externally connected to the circuit. Why Shunt Connect in parallel with Ammeter? The ammeter designs …

## Ammeter

Definition: The meter uses for measuring the current is known as the ammeter. The current is the flow of electrons whose unit is ampere. Hence the instrument which measures the flows of current in ampere is known as ampere meter or ammeter. The ideal ammeter has zero internal resistance. But practically the ammeter has small …

## Volt-Ratio Box

Definition: The volt-ratio box measures the high voltage. The construction of the volt-ratio box is very simple. It consists the simple resistive potential divider which has many tapping on the input side. The whole arrangement of the volt-ratio box is placed inside the wooden box. The volt-ratio box gives the accurate result of measure voltage. …

## Difference Between Stator & Rotor

The stator and rotor both are the parts of the electrical motor. The significant difference between the rotor and the stator is that the rotor is the rotating part of the motor whereas the stator is the stationary part of the motor. The other differences between the stator and rotor are shown below in the …

## Difference Between Slip Ring & Split Ring

The most significant difference between the slip ring and split ring is that the slip ring uses for transferring the power between static and rotary part. Whereas, the split ring uses in DC machine for reversing the polarity of the current. The other differences between split ring and slip ring are represented below in the comparison …

## Difference Between Static & Current Electricity

The most significant difference between the static and current electricity is that in static electricity the charges are at rest and they are accumulating on the surface of the insulator. Whereas in current electricity the electrons are moving inside the conductor. The other differences between the static and current electricity are explained below in the …

## Earth Tester

Definition: The instrument used for measuring the resistance of the earth is known as earth tester. All the equipment of the power system is connected to the earth through the earth electrode. The earth protects the equipment and personnel from the fault current. The resistance of the earth is very low. The fault current through …