## How do you measure power with a watt meter?

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.

## Can we measure power factor using two watt meter method?

Two Wattmeter Method can be employed to measure the power in a 3 phase, three-wire star or delta connected the balanced or unbalanced load. The total instantaneous power absorbed by the three loads Z1, Z2 and Z3, is equal to the sum of the powers measured by the two wattmeters, W1 and W2.

**What is the advantage of 2 wattmeter method?**

The main advantage of this method is that it can measure both balanced and unbalanced load conditions.

**How is 3phase measured?**

In a balanced 3-wire, 3-phase load circuit the power in each phase is equal and, therefore, the total power of the circuit can be determined by multiplying the power measured in any one phase. Hence, the power measurement in three-phase, three-wire circuits can be carried out by using the one wattmeter only.

### What is the difference between 1 phase and 3 phase power?

What are the differences between Single-Phase Power and Three-Phase Power? In a single-phase power supply, it only requires two wires, namely Phase and Neutral. On the other hand, a three-phase power supply only works through three wires, including three-conductor wires and a neutral wire.

### Which is the best method for measuring power?

The best method to measure the power in three phases balanced circuit is the one-wattmeter method. Thus option C is correct.

**What is the significance of equal readings on the two watt meters in the two wattmeter method?**

The phase difference VYB and IY is (30⁰ + ϕ). The above equation (1) gives the total power absorbed by a 3 phase balanced load. Thus, the sum of the readings of the two Wattmeters is equal to the power absorbed in a 3 phase balanced load.

**Which one is wrong for a two wattmeter method of power measurement *?**

The total reactive power can be calculated only if the system (including the load) is balanced. If the system and/or the load is unbalanced, then can’t be calculated using the two wattmeter method.

#### What is the effect of power factor on the reading of two wattmeter?

Similarly, power measured by the wattmeter-2 is, W2 = VL IL cos(30 + 0) = √3/2 VL I. Hence, at unity power factor, both the wattmeters read half the value of total power consumed by the load i.e., both wattmeters read the same values.

#### What is the two wattmeter method of power measurement?

Two Wattmeter Method of Power Measurement. Two Wattmeter Method can be employed to measure the power in a 3 phase, three wire star or delta connected the balanced or unbalanced load.

**What does the second wattmeter read?**

As second wattmeter reads –ive hence wattmeter won’t read anything practically, therefore for second wattmeter we need to interchange the leads of either Pressure Coil or Current Coil so that second wattmeter may read value.

**What is a 3 Phase 2 wattmeter?**

The schematic diagram of 3 phase 2 wattmeter is shown below It consists of 2 wattmeters like W1 and W2, where each wattmeter has a current coil ‘CC’ and a pressure coil ‘PC’. Here, one end of wattmeter ‘W1’ is connected to ‘R’ terminal whereas one end of wattmeter’ W2′ is connected to’ Y’ terminal.

## How wattmeter is made?

The wattmeter usually consists of two coils “CC” current coil which is usually connected in series with load current and a voltage/ pressure / potential coil “PC”, this coil is usually connected across the load circuit. The electrical power can be represented in three forms they are real power, reactive power, and apparent power.