How does a wattmeter work

The reason for this is that the potential coil is allowed to move whereas the current coil is kept fixed. When the current passes through the current coil, it creates an electromagnetic field around the coil.

The strength of this electromagnetic field is directly proportional to the amount of current passing through it. In case of DC current, the current is also in phase with its generated electromagnetic field. The voltage is dropped across the potential coil and as a result of this complete process, the needle moves across the scale.

This was the case of DC power. But the question that arises here is that how will a wattmeter measure the AC power and this power factor? So the wattmeter simply measures the average power in case if AC power is required. This was all about watt meters. The induction wattmeter consists of two laminated electromagnets viz.

Shunt Magnet and Series Magnet. The shunt magnet is connected across the supply and carries a current proportional to the supply voltage. The series magnet is connected in series with the supply and carries the load current. The coil of series magnet is made highly noninductive. A thin disc made up of aluminium mounted on a spindle is placed between the two magnets so that it cuts the flux of the two magnets.

The voltage coil is mounted on a circular manner. It is placed between the two parts of the current coil. Share it:. Write for This Channel. Related Articles 1. Electricity Prices Explained. What is Inductance? Power Factor Explained. Unit of Electricity - Fundamentals Explained. Green Electricity. Resistances in Parallel. Wattmeters Explained.

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