Question

What is the formula for finding multiplication factor in LPF wattmeter?

Answer 1

Hint: To find the formula of multiplication factor in LPF wattmeter first we will discuss about what is LPF wattmeter and what is multiplication factor then only we will able to reach the result that will lead us to the formula of multiplication factor of LPF wattmeter.

Complete step-by-step solution:
In order to find the formula of multiplication factor of LPF wattmeter first we will discuss the definition of multiplication factor:
Multiplication factor can be defined as the ratio of number of neutrons produced in a nuclear pile to the number disappearing that must be equal or must exceed the unity for a chain reaction so as to take place and this is also called reproduction constant or reproduction factor.
Multiplication factor of wattmeter is that parameter of virtue that helps us in finding a small scale wattmeter to get the power readings up to multiplication factor times that are multiplied to the smallest scale possible.
It helps us to measure powers up to 5-6 times the power of wattmeter to get the smallest scale value according to our convenience.
Now let us discuss what is LPF wattmeter?
LPF wattmeter is an instrument that measures the low value of power factor accurately that’s why it is called low power factor wattmeter. The low power factor meter is used to measure power of highly inductive current. It is also used in resistive current where its power factor range is from 0.5- 1.
Let us now find the formula of multiplication factor for wattmeter:
Now, here we will first take the reading of voltage range and the reading of current range after taking all the readings we will use the formula of multiplication factor of wattmeter
The formula is given as
\[Multiplication\_factor=\dfrac{(Voltage\_range\times Current\_range\times power\_factor)}{Range\_of\_wattmeter\_scale}\]

Note: Low power factor (LPF) wattmeter helps us to find the result of our ranges accurately and this multiplication factor moreover helps to find the answer in the smallest value that is 5-6 times the power of wattmeter so as to get the answer according to our convenience.