Conversion To KWh

@ishan-nohePN • Oct 21, 2024

Oct 21, 2024

1.0K

How to convert any quantity to KWh if voltage, frequency and Current is given?

Say, my refrigerator has rating 230V, 50Hz, 1.1A. What is the KWh rating?
Also what does VA unit mean?

Does 1 unit of electricity stand for 1Wh?

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aarthivg

@aarthivg-HH344f • Apr 3, 2012

Issue
Does 1 unit of electricity stand for 1Wh?
One unit of electricity is exactly equal to 1000 Watts of power used for 1 hour.
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aarthivg

@aarthivg-HH344f • Apr 3, 2012

Issue
How to convert any quantity to KWh if voltage, frequency and Current is given?

Say, my refrigerator has rating 230V, 50Hz, 1.1A. What is the KWh rating?
one watt is the rate at which <a href="https://en.wikipedia.org/wiki/Electrical_work" target="_blank" rel="nofollow noopener noreferrer">Electrical Work</a> is done when one <a href="https://en.wikipedia.org/wiki/Ampere" target="_blank" rel="nofollow noopener noreferrer">Ampere</a> of current flows through an electrical <a href="https://en.wikipedia.org/wiki/Potential_difference" target="_blank" rel="nofollow noopener noreferrer">Potential Difference</a> of one <a href="https://en.wikipedia.org/wiki/Volt" target="_blank" rel="nofollow noopener noreferrer">Volt</a> .
W= V*I

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aarthivg

@aarthivg-HH344f • Apr 3, 2012

Issue
Also what does VA unit mean?
Apparent power is expressed as VA unit, product of rms voltage and rms current
VA -voltage-ampere
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Shreyas Sule

@shreyas-yx6FwP • Apr 3, 2012

All calculations are given for single phase AC loads at homes such as refrigerators,heaters,etc:

Issue
How to convert any quantity to KWh if voltage, frequency and Current is given?
Power (KW)= Voltage (V) x Current (A) x Power factor / 1000
Energy (KWh)= Power (KW) x Time (Hrs)

Power factor for AC supply of 50 Hz is normally assumed to be from 0.6 (worst) to 0.8 (still bad!)

Issue
Also what does VA unit mean?
Apparent Power (VA) = Real Power (W) / Power factor

Real power (W) represents the actual energy transfered from source to the load.
As the loads (refrigerators, heaters,etc) are inductive in nature, there is an additional component of power which is not actually transferred to load to do any fruitful work. This component is called reactive power and circulates back and forth between load and source. The net addition of reactive power (VAR) over any full cycle is zero. Eventually, these two components of the power taken from the source add up to apparent power (VAR).

Issue
Does 1 unit of electricity stand for 1Wh?

1 unit = 1 KWh
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