For what power factor one of the wattmeter reads zero?

0.5
4. Explanation: When p.f. = 0.5, 0 = 60° and one of the wattmeters reads zero.

What is the power factor if one of the wattmeter gives negative reading?

For angle, more than 60° or cosϕ < 0.5, wattmeter will give a negative reading.

What is power factor of a wattmeter?

A modern digital wattmeter samples the voltage and current thousands of times a second. For each sample, the voltage is multiplied by the current at the same instant; the average over at least one cycle is the real power. The real power divided by the apparent volt-amperes (VA) is the power factor.

When power factor is 1 What does the two wattmeter reads?

In the measurement of 3-phase power by 2 watt-meter method, if the 2 watt-meter readings are equal, the power factor of the circuit is? W1 = W2 = cos 0° = 1.

What is a low power factor wattmeter explain its working?

Definition: The instrument that measures the low value of power factor accurately is known as the Low Power Factor Wattmeter (LPFW). The low power factor meter is used for measuring the power of the highly inductive circuit. It is also used in the resistive circuit which has a power factor range from 0.5 to 1.

What will be the power factor in two wattmeter method when two wattmeter readings are equal?

When both the wattmeter’s show the same positive reading, ϕ becomes zero and hence power factor is unity.

What does it mean when one of the wattmeters only reads 0 Watts?

I’m not sure what you mean by “one of the wattmeter.” Assuming your meter is connected correctly and reading power at the load point or desired output location, if your meter reads zero watts then it’s probable that all of the power in your system is reactive.

What is the power factor of the load in two wattmeter?

6. In two wattmeter method of measuring power, one of the wattmeters reads zero watts. The power factor of the load is 7. While measuring power by two wattmeter method, the phase voltage is 3 V whereas the phase current is 0.5A.

How do you measure power by two wattmeter method?

In two wattmeter method of measuring power, one of the wattmeters reads zero watts. The power factor of the load is 7. While measuring power by two wattmeter method, the phase voltage is 3 V whereas the phase current is 0.5A.

What is the power factor of a balanced 3 phase circuit?

In the measurement of power in a balanced 3-phase circuit by two wattmeter method if the two wattmeters show equal readings. Then the power factor of the circuit is 19. A wattmeter is marked 15A/30A, 300V/600V and its scale is marked up to 4500 watts.