# Circuit Globe All about Electrical and Electronics

## Rectifier Ammeter

The meter is generally used for measuring the particular quantity. The unit of current is ampere, and the meter which measures the current is known as the ammeter. The rectifier ammeter uses the moving coil along with the rectifier for measuring the current. The main use of the rectifier is to convert the alternating current into…

## Three Phase Wattmeter

Definition: Three-Phase Wattmeter is used for measuring the power of the three-phase circuit. In three-phase Wattmeter, the two separate Wattmeter are mounted together in the single unit. Their moving coils are placed on the same spindle. Three-Phase Wattmeter has two elements. The single element is the combination of the pressure coil and the current coil. The…

## Torque/Weight Ratio of an Indicating Instrument

Definition: The ratio of torque to the weight of the moving part of an instrument is known as a torque/weight ratio. It indexes the performance of the instrument. The higher value of torque/weight ratio shows that the instrument has good performances. The value of torque/weight ratio of the moving part of the instrument should not be…

## Construction of Potential Transformer

The potential or voltage transformer is a step-down transformer used for transformation of voltage from a high value to fractional value. The measuring instrument like ammeter, voltmeter, wattmeter, etc. designs for low voltages. If the measuring apparatus connects to the high voltage lines for measurement, the devices may get burned or damage. Thus, the potential…

## Electrothermal Instrument

Definition: The instrument whose working depends on the heating effects of the measuring current is known as the electrothermal or electrothermic instrument. This device is used for measuring the high-frequency current. The most significant advantage of this type of instrument is that it measures the high range frequency current more than the Moving Iron and…

## 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…

## Resistance Box

Definition: The box which contains the resistors of different values for estimating and comparing the resistance is known as the resistance box. The accuracy of the resistance box is very high. The main application of the resistance box is to control the specific value of current to flow through the circuit. The main advantage of…