# Wattmeter

The wattmeter is more common than you imagine and is found everywhere we go, because although we do not know it, it is immersed in homes, offices, stores, industries, among many other places.

Since its creation, it has become a fundamental pillar for controlling the use of electrical energy, since in simpler terms, it is what allows measuring the electrical supply that a device has, which translates to the electrical consumption that it occupies in the national electricity system.
However, its use does not lie there as it is used in physical workshops and laboratories , which is why it is necessary to know all the benefits that this unique measuring instrument has.

## What is a Wattmeter?

The wattmeter is nothing more than the union between the potentialities enjoyed by ammeters and voltmeters.
In this case, it is responsible for measuring watts or watts, which has a certain current for a unit of time.
Watts are a unit of power , which is equivalent in other scales to one Joule per second, which really means that they are very powerful . In addition, they can be used in direct and alternating currents.
It is also known as the name Wattmeter , since in the English system, the watt is translated as Watts, which is why it is used with both names, depending on how it is used where you are.
In general terms, it is a very simple instrument to use , which is why you don’t have to worry, there are even people who make this instrument at home, to count in their experiments.

## What is a Wattmeter for?

The Wattmeter is an instrument that is used to measure the electrical power and also the current supply that a given appliance has.
Being a fusion of the ammeter and voltmeter , it can determine the difference that exists between the two, in order to later reveal the number of watts per unit of time, which are given to the device by the current, whether direct or alternating.

### How does a Wattmeter work?

The wattmeter works with a system of coils to make the measurement, two of them are fixed and connected to an electrical circuit in series; these are called amperometric coils.
On the other hand, there is the moving or voltmeter coil , which like a voltmeter is connected in parallel with the circuit.
Each of them will make their respective measurements, then what an internal processor will do is multiply their values , in order to obtain the total power or the number of Watts.

## Uses of the Wattmeter

The use of the wattmeter is broad, firstly on a large scale, it is an essential component in power generators or electrical systems, whether local, regional or national.
On a small scale, it can be used as a meter in homes, which is important to determine energy expenditure and thus national companies budget prices for energy consumption.
It can be used to measure, like a mobile device, the watts consumed by a specific piece of equipment, a circuit or any other device that receives electrical charges.

### Types of Wattmeter

The Wattmeter has a broad classification, as it is a simple element that fulfills specific but varied functions, however, what makes the difference is the technological contribution and specialization. The Wattmeter classification is as follows:
• According to the operating mechanism
It refers to the degree of technology that this type of wattmeter has internally, since one works mechanically, while the other electronically.

### Analog wattmeter

In this case, its internal mechanism has a coil, which when rotating sends signals to the needle, causing it to move according to the intensity of the rotation. The needle system is pointing to a measurement scale, with which you can locate the exact measurement of the potential of a given electrical device or system.

### Digital wattmeter

It has the additional ability to store energy , as a way to always keep the gravitational field active.
This wattmeter, inside it has a system of plates, which receive that potential difference and through another internal system of the wattmeter, transform it into an intensity that will be processed by a microprocessor, in order to obtain an exact quantity. , which is reflected digitally on a screen.
• Depending on the type of current they work with
Current is always important in an electrical circuit, which is why there is a model for each type or a model for both.

### DC wattmeter

This is the primitive model, the one that was used to exclusively measure the direct current that circulated through a given device.
Wattmeter for alternating current
They are one of the most recent models and are born from those that use direct current, as you could see in the history of the Wattmeter. This model makes measurements only in alternating current.

### Dual-function wattmeter

They are the models that are currently used, since most of them have this dual feature, meaning they work with both direct and alternating current.
• Depending on the type of installation in which it operates
Installations are differentiated based on current inputs and how they can present variations in current flow.
Wattmeter for single-phase connections
This model works when the system has a single phase, that is, the current travels through a single conductor, hence its mono prefix.
Wattmeter for three-phase connections
Based on the previous concept, in this case, it does not travel through a single conductor but through three conductors, therefore, more variations may occur, which are taken by the wattmeter.
Wattmeter for dual connection
They are a current specialization, where a wattmeter has the ability to act on both single-phase and three-phase current .
As you can see, thanks to the historical background, these instruments have been able to evolve and specialize in specific tasks , in order to obtain better measurement results.