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What is electronic wattmeter?
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.
How does a digital wattmeter work?
Digital wattmeters measure current and voltage electronically thousands of times a second, multiplying the results in a computer chip to determine watts. The computer can also perform statistics such as peak, average, low watts and kilowatt-hours consumed. They can monitor the power line for voltage surges and outages.
What are the type of wattmeters used in electrical circuits?
There are two types of Wattmeter given below:
- Dynamometer Type Wattmeter.
- Induction type Wattmeter.
How does wattmeter measure average power?
Each wattmeter measures a line-to-line voltage between two of the three power supply lines. In this configuration, the total power, watts is accurately measured by the algebraic sum of the two wattmeter values.
How many terminals has a wattmeter?
The current coil of a wattmeter has two terminals Main(M) and Load(L) and Pressure Coil has + or -V and COM(C).
What types of errors are occurred at Electrodynamometer wattmeter?
Following are the errors in the electrodynamometer type wattmeters:
- Errors in the pressure coil inductance.
- Errors may be due to pressure coil capacitance.
- Errors may be due to mutual inductance effects.
- Errors may be due connections.
- Error due to Eddy currents.
- Errors caused by vibration of moving system.
How many coils does a wattmeter have?
Wattmeter usually consists of two coils known as Current coil and Potential coil. The Current coil is connected in series with the electric circuit whereas the movable Potential coil is connected in parallel.
How do you read a wattmeter?
Read your power meter from right to left and write down the numbers that the each arrow points to.
- If the arrow on a dial is in between two numbers, record the lower number.
- If the arrow on the dial is exactly on a number, record that number [source: Nova Scotia Power].
How is wattmeter measured?
Each wattmeter measures a line-to-line voltage between two of the three power supply lines. In this configuration, the total power, watts is accurately measured by the algebraic sum of the two wattmeter values. Pt = P1 + P2. This holds true if the system is balanced or unbalanced.
What are wattmeter terminals?
A wattmeter has two coils, namely the current coil (CC) and the voltage coil. Each coil having two terminals makes the wattmeter a four terminal instrument. These terminals are named as , Mains(M) Load (L)