What would be the effect in the wattmeter reading when the connection between M and L is reversed?

If you reverse either one, the meter will read downward (assuming it was reading upward before you reversed the connection); if you reverse both the meter will still read upward.

When wattmeter C terminal is connected to L terminal in laboratory experiment it means?

C,V are two terminal of voltage coil & M,L two terminal of current coil. The wattmeter has current coil and pressure coil. Since the current coil is connected in series with the load, in such a way that one terminal is connected to the main wire or main supply (M) and other terminal is connected to the load (L).

How do you hook up a watt meter?

In this wattmeter, terminals 1 and 2 for the voltage or pressure coil, and terminals 3, 4 for the current coil. So first make a short between terminals 1 and 3. Then connect the phase to terminal 1 and neutral to terminal 2. Now power supply connection is completed.

When measuring power in a circuit with low current the wattmeter current coil should be connected?

when measuring power with the electrodynamometer wattmeter in a circuit having a low power factor : the current coil should be connected on the load side. the current coil should be connected on the supply side.

What would be the effect in wattmeter reading when the connection between M and C is changed as L and C?

The wattmeter will give an erroneous measurement. The wattmeter will be damaged.

What will happen if we interchange potential coil and current coil in a wattmeter?

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.

Why do we need to short M and C in wattmeter?

Originally Answered: Why do we short the M & C terminals during a wattmeter connection? Main and Common terminals are shorted in order to make the “load on the current coil” side configuration or you can say to put the potential coil before current coil.

What is the full form of M in wattmeter connections?

M stands for Main side and L stands for Load side. While connecting the current coil in the circuit, this sequence must be followed strictly.

When measuring power with an Electrodynamometer in a circuit has low power factor?

There is a requirement of low power factor meter because, the usage of ordinary electrodynamometer wattmeter to measure power factor of a low pf load gives inaccurate results. Now there are two main reasons that would suggests us that we should not use ordinary wattmeter in measuring the low value of power factor.

Which meter is used to measure the power Mcq?

Measurement of Energy MCQ Question 10 Detailed Solution Energy meter: Energy meter measures electrical energy in a kilowatt hour. It is also known as kilowatt-hour meter or Induction type watt-hour meter.

How to connect a current coil in wattmeter?

The current coil in wattmeter is connected along the circuit to carry load current. The two terminals of the current coils are named as M and L. M stands for Main side and L stands for Load side. While connecting the current coil in the circuit, this sequence must be followed strictly.

What is two wattmeter method for power measurement?

In this post, we will discuss the Two Wattmeter Method for power measurement. In two wattmeter method, a three phase balanced voltage is to a balanced three phase load where the current in each phase is assumed lagging by an angle of Ø behind the corresponding phase voltage.

Is a wattmeter a two or a four terminal device?

A wattmeter is a four terminal device. We usually connect it in power circuits by shorting one current coil and one potential coil terminal thereby making it a three terminal device. The point to focus is – wattmeter connection is very important to get correct reading.

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.