Why pressure coil has more turns than current coil?

For instance if we talk about wattmeter then in wattmeter the pressure coil or also known as voltage coil, the number of turns are large so that there will be large resistance over there and current coil has lesser turns than voltage coil so that its resistance will be minimum.

What is pressure coil in energy meter?

A coil having a large number of turns of fine wire is wound on the middle limb of the shunt magnet. This coil is known as voltage coil or pressure coil and it is connected across the supply mains. Hence in an energy meter, the energy measures in kWh and the magnitude of flux vary due to abnormal current & voltage.

What happens if you change pressure and current in a coil?

Firstly, the circuit wont work since potential coil has very high resistance and if it is used in place of current coil the current flow in circuit drops close to zero. More importantly there is a very high possibility of the wattmeter getting damaged due to flow if excess current in current coil.

What is a pressure coil?

A pressure coil is also known as the voltage coil and is generally used in a wattmeter. There is a prominent difference between current coil and pressure coil The current coil is always connected in series. While the pressure coil is connected in parallel with the load.

How many coils are in a Wattmeter?

two coils
The Electrodynamometer wattmeter has two coils i.e., fixed and moving coils. The fixed coil is connected in series with the circuit in order to measure power consumption.

How many coils does an energy meter have?

The metallic disc is acted upon by two coils. One coil is connected 0r arranged in such a way that it produces a magnetic flux in proportion to the voltage and the other produces a magnetic flux in proportion to the current. The field of the voltage coil is delayed by 90 degrees using a lag coil.

What is potential coil?

Definition of potential coil : a coil or winding connected in shunt across a circuit (as in a wattmeter)

What is a wattmeter used for?

The wattmeter is an instrument for measuring the electric active power (or the average of the rate of flow of electrical energy) in watts of any given circuit. Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power; other types are required for radio frequency measurements.

What will happen if the current coil & potential coil of wattmeter is interchanged?

In the question given that, the current and potential coils of a dynamometer type wattmeter were accidentally interchanged while connecting. Hence total voltage applies across current coil which has very less resistance which leads to damage the current coil.