What are Watt, Kilowatt and a unit of electricity

on August 7, 2017

When we get our electricity bills, it shows that we have used a certain number of units for the given period. When we go to buy appliances, most of them have watts mentioned on them. If you find it difficult to understand the relation between the two, then you are not alone. Electricity bill and its components are confusing to many and with this article we will try to explain what are watt, kilowatt and a unit of electricity.

What are Power and Energy/Electricity

Power and Energy/Electricity are two words that are used so much for each other that many feel that they mean the same. Interestingly both of them have a very different meaning. Power is the rate at which electricity is used and energy/electricity is the actual consumption. To give an analogy, power is similar to speed but electricity/energy is the actual distance traveled.

So        Power x Time = Electricity (or energy)

Just like          Speed x Time = Distance Traveled.

Power and its units

Power is always represented in watt (W) or kilowatt (kW). A thousand (1000) watts make one kilowatt. So if any appliance is rated as 1.2 kW then it means that it consumes electricity at a rate of 1200 W. Now as we discussed earlier that power is the rate at which electricity is consumed and not the actual electricity consumed, Watt or Kilowatt just represent the rate at which electricity is consumed per hour. Which means that when you buy a 100 W bulb, it does not consume 100 units of electricity but consumes at a rate of 100 W.

Energy/Electricity and its units

A unit (as mentioned on the electricity bills) is represented in kWH or Kilowatt Hour. This is the actual electricity or energy used. If you use 1000 Watts or 1 Kilowatt of power for 1 hour then you consume 1 unit or 1 Kilowatt-Hour (kWH) of electricity. So the reading on the electricity meter represents the actual electricity used. Just like the odometer on your vehicle that shows the actual distance travelled by the vehicle, electricity meter shows the amount of electricity that is used. So a 100-Watt bulb if kept on for 10 hours will consume:

100 x 10 = 1000 Watt-Hour = 1 Kilowatt-Hour (kWH) = 1 units (on your meter).

Estimating units consumed by any appliance

Now with most of the concepts explained we would like to make it easy for you to calculate how much units does any appliance consume. Most appliances have wattage written on them (either on their container box or somewhere on the appliance). Once you have the wattage, next you need to figure out how many hours a day do you use it. After that you can use the formula below:

Daily Units = (Wattage x Usage hours per day) ÷ 1000

Monthly Units = Units x 30 (or 28,29,31 based on month)

Please note that this formula may not work always. For appliances like Air Conditioner, Water Heater, Cloth Iron (any heating or cooling device) and pumps, this will not work.

Check this video to make it easier to understand:

Also check this video that can help you understand how many units your appliances are consuming:

Source of Information:

http://www.energysavers.gov/your_home/appliances/index.cfm/mytopic=10040

http://en.wikipedia.org/wiki/Watt#Confusion_of_watts.2C_watt-hours.2C_and_watts_per_hour

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अगर आप के कुछ भी सवाल हैं, वह आप नीचे दिए हुए सवाल-जवाब सेक्शन में पूछ सकते हैं। आप अपने सवाल हिंदी में भी पूछ सकते हैं और हम आपको हिंदी में ही जवाब देंगे। कृपया एक ही सवाल को बार बार ना डालें। आप एक बार जब "submit " बटन दबाएंगे, उसके बाद आपका सवाल यहाँ दिखने में थोड़ा टाइम लगेगा। कृपया धैर्य रखें। अगर हमारे पास आपके सवाल का जवाब है तो हम उसे जल्दी से जल्दी जवाब देने की कोशिश करेंगे। कृपया अपने सवाल ई मेल या सोशल मीडिया पर ना डालें।

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1.5 ton ka ac 1 ghante me kitna voltage lega

Abhishek Jain (Mod)

India mein AC chalane ke liye 220-230 V ki zaroorat padti hai.

1.5ton ka ac 1ghante me kitna unit charge krega

Abhishek Jain (Mod)

Aapke AC par kaafi depend karta hai .... jo achche energy efficient AC aate hain woh 0.6-0.7 units per hour mein bhi chal jaate hain ... aur jo inefficient hote hain woh 1.5-2 unit tak bhi le lete hain.

अगर मैं 1200 W का मशीन 24 Hour चलाता हूं तो 1 दिन में कितना यूनिट खर्च होगा

Abhishek Jain (Mod)

(1200 x 24)/1000 = 28.8 units.

How many Diffrance of rate (Per Unit) load of 4killo watt Convert To 5killo watt

Amp =kilowatt

Abhishek Jain (Mod)

What is the voltage at which you are measuring?

1unit=how many kilowatt

Abhishek Jain (Mod)

Hi Ashish,

It is all explained in the article above.

mujhe bataye ki meter ko kaise dekhte h i mean abhi new lga h na so abhi iska knowledge nahi h to please batayiye ki kaise pta chalega ki kitna unit bijli gira h usme kya dekhna hota h please tell me..

150 unit kWh consumptionper manth bijli ka bill kitna hoga

hi, unit(kwh) consumption of my meter is 166 per month, 2month back kw show 1.03 and now showing 14.74kw , so what is meaning of kw. and can it affect unit. plz explain in hindi

Abhishek Jain (Mod)

KW मतलब आपका system कितनी तेज़ी से बिजली खा रहा है और units मतलब उसने कितनी बिजली खायी. जैसे की रफ़्तार यह बताती है की आपकी गाडी कितनी तेज़ी से चल रही है और KM से पता चलता है की आप कितनी दूर चले। अगर एक 100 वाट का बल्ब 10 घंटे चलता है तो वह 100x10 = 1000 Wh यानी की 1 unit बिजली खता है। जैसे की अगर आपकी गाडी 100 km /hr से चल रही है तो 10 घंटे में 100x10 = 1000 km चलेगी.

अब आपके सारे जो उपकरण है वह सब मिल के आपका KW बनाते हैं। तो अगर आपके पास एक बल्ब है जो 100 watt का है और एक पंखा है जो 90 watt का है तो आपका कुल KW 190 हो जाता है। और अगर यह 10 घंटे चलता है तो 190x10 = 1900 Wh याने की 1.9 units खता है।

आपके बिल में महीने के सारे units आते हैं। तो अगर आपने 100 घंटे पंखे चलाये हैं और 200 घंटे बल्ब जलाये हैं तो उनके सारे units एक साथ कितने होंगे वह आपके बिल पर units कर के आएंगे।

और जो kW आपके बिल पर आता है वह महीने में किसी भी 15 मिनट में जो सबसे ज़्यादा कुल kW (सारे जो भी उपकरण उस 15 मिनट में चल रहे थे उनका कुल kW ) होते हैं वह आता है।

2352 unit consumed in my house. Please advise me solar system will be affordable. And investment kitna hoga

My monthly consumption is 150 units in a month. What capacity of solar plant should I install.

Abhishek Jain (Mod)

Daily consumption will be about 5 units. So 1.5-2 kW would be needed.

My monthly consumption is 150 units. What capacity of solar plant should I install

Can u please explain me what is security deposit, i am consumer of wesco electricity and my power load is 3.5kw they are telling that i am using more than 3.5kw.

Abhishek Jain (Mod)

Concept of security deposit has been added to electricity bills to make sure that electricity distribution company has some money from a customer in case the customer does not pay electricity bills. In India, lot of people do not pay electricity bills.

Usually this deposit amount is based on the past bills or connected load.

fridge ke liye 1 din me kitne unit lagte hai

Abhishek Jain (Mod)

depend karta hi ki kitna purana fridge hai .... naya fridge din ka 1 unit se bhi kam leta hai .... purane 3-4 unit tak bhi lete hain.

Ramesh loungani

1kw= how many unit please reply soon

Abhishek Jain (Mod)

1 kW in 1 hour will consume 1 unit. In 2 hours it would consume 2 units and so on.

I CONSUME 2000 UNITS PER MONTH OF ELECTRICITY WANTS TO SHIFT TO SOLAR HOW SHOULD I PROCEED

Please Contact us @+91-78741-75445 for solar plant installation work at the best price in the Indian market.

Good afternoon Sir,
Am mailing from Kashmir. The coordinates of my house are : Latitude = 34.006010 N Longitude = 74.923800 E

To overcome frequent electricity cuts I want to install solar panels on the roof my double storied- house. The roof is fully exposed to sun and there is no nearby building or tree which casts shadow on it.
My net consumption of electricity 20 units per day. The area of the roof of my house approximates to 1250 sq. ft.

Kindly inform me about feasibility of installing solar plants along with the total cost of the project.

Thanks and regards

Please Contact us @+91-78741-75445 for solar plant installation work at the best price in the Indian market

Abhishek Jain (Mod)

Hello Mr Bhat,

My guess is that irradiation levels in Kashmir will be lower as compared to the rest of India. So I am not sure how much electricity would you be able to generate. But I think 3 units per day from a kWp plant should be possible. A kWp plant should cost you about Rs 90000-1 lakh. You will need 6-7 kWp for the whole consumption. Each kWp needs 100 sq ft. So it is feasible to install solar in your house.

Beautiful .... really you made it simple

Sir,
I am from Vadodara my house electricity bill showing @300 units monthly so I want to know how much capacity will need for solar system please.

Please Contact us @+91-78741-75445 for solar plant installation work at the best price in the Indian market

Abhishek Jain (Mod)

300 units would make it 10 units a day (roughly). 1 kWp system generates 3-4 units of electricity. So you need about 3 kWp system for your house.

Hi Abhishek i bought a Air conditioner ( Voltas 185 LY ) which has power consumption of 1495 watts . Could you please tell me how much power does it consumes if i turn it on for 6 hours on daily basis.

Abhishek Jain (Mod)

Difficult to tell exact value but to get an approx, it would be 1495*0.7/1000 = about 1 unit in an hour. So 6 units per day.

Hi Abishek i bought a Air conditioner(ASGA18FMTA) which has power consumption of 1830 watts . Could you please tell me how much power does it consumes if i turn it on for 4-6 hours on daily basis. I will maintain in it A/C in 24 degrees at max.

Abhishek Jain (Mod)

Difficult to tell the exact amount as it depends on the heat load. But at a very high level assuming it is right sized, it will have cycle time of 75% (running for 45 mins in an hour), then the power consumption would be 1830*0.75 = 1372.5 Wh or 1.3725 units in an hour. In 6 hours it would consume 8.235 units. And this is assuming you have rightsized the AC and it is run at 25 degrees. At 24 degrees it may go up to 9 units.

thanks for prompt reply :)

Hi Sir,
I want to shift on Solar enrgy. i live in apartment but having sun light 7-8 hour directly on my window. no obtecals.
My electric bill is an average 150 unit and in summer 220 unit.
can u guide me for my requirment.
as per my understanding
2 -3 solar panel
not sure what type & capacity of battery need ..?
please suggest.

Regards,
Mahesh Lad

Abhishek Jain (Mod)

Hello Mr Lad,

Solar Panels have to be in right inclination and direction to get the right output. I am not sure where you live, but in Mumbai it should be inclined at 18 degrees and should face south. On a window it will be at 90 degrees. So I doubt that it will work for you in an apartment.

Hello

I live in Goa. I do not switch off our room light (tube light) and leave it on everyday (4 to 5 hours usage everyday) is it such a big deal? i do this because the tube light starter might get worn out sooner than later. But Im not sure if I am doing the right thing, trying to save money on a starter or paying more on electricity? your assistance would be appreciated.

Abhishek Jain (Mod)

It is better to switch off the light when not in use. The starter will not get worn out because of that. Also these days most tubelights have electronic ballast that are really long lasting. Do you have old tubelights with starter and electromagnetic ballast?

Abhishek Jain - GOD BLESS YOU (Thank you for sharing your knowledge)

Abhishek Jain (Mod)

Thanks Santosh. We are glad that you found the website useful. Thanks a lot for the appreciation.

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Hello, I have 3 Ac at my Home I just wants to know which Ac is Consuming How much Electricity.
O General 1.5 Ton 5 Star Split Ac for 6 Hours. (Room Size 9 x 12 Ft Master Bedroom)
Panasonic 1.5 Ton 2 Star Split Ac for 6 Hours. (Room Size 9 x 18 Ft Hall)
Voltas 0.75 2 Star Window Ac for 6 Hours. (Room Size 7 x 6.5 Ft Small Bedroom)

Your Reply will help me a lot Thank in Advance.

Abhishek Jain (Mod)

Hi Naveed,

There are two ways you can do it. The cheaper option is to buy a submeter from the market and get it fabricated by a local electrician in the manner explained in this post: http://www.bijlibachao.com/assessment/measuring-electricity-consumption-of-home-appliances-and-doing-self-audit.html

The other slightly expensive ways is to go for a kill a watt meter that can handle 15 Amp current. More on kill a watt meter on this post: http://www.bijlibachao.com/electricity-bill/kill-a-watt-meter-p3-power-analyzer-powermeter.html

You can get kill-a-watt meter on any ecommerce site (Amazon or ebay). But just make sure that it can handle 15 Amp current (so that it can handle your ACs).

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I want a solar water heater for my hostel purpose what will be the cost

Sir, 25 Hp Power use 10 hours in a day so how many units readings

Abhishek Jain (Mod)

1 Hp is 750 watts. You can use the formula given above on this page to do the calculations.

Hello abhishek sir please tell me that when i use a 15W tubelight and a ceiling fan for 20 hours and one 10 W tubelight for 6 hours then how much unit consumed by me in a day. Please sir reply fast

Abhishek Jain (Mod)

The formula for calculation is given above on this page. Please use the same.

I run a Desktop Computer (with CRT monitor) for 16 hours everyday,
Two 40watt Lights 5pm to 1am,
One mini speaker 2.1,
One table fan(it has 3 gears speed system) for 12 Hours everyday,
One Ceiling Fan almost 18 Hours everyday,
One Samsung TV 21 inch (it has 4* energy saving sticker) runs for 7 Hours everyday.
Three Mobiles of 2700mah battery charges 2 times everyday.

in the end I get 170 units Electric bill....
Is it normal or the bill is very high/low according to the usage?

Abhishek Jain (Mod)

170 units sounds normal for your usage. Your two fans (ceiling fan, table fan) and your computer would consume most of the electricity.

Please tell me if same formula will be applicable on commercial pizza oven. It say 2kw.

ROOPCHAND CHHONKAR

How many units are use in a months by 1kwh connection please clear

Abhishek Jain (Mod)

1 kWh is 1 unit of electricity.

Time is ,Hours, second,

sir i use in my house . 2 cooler . 3 roof fan . i hp water moter . 3 led bluf 10 watt ( 3 to 4 hours) 2 cfl 25 watt.
than i gat received ele bill 2 month 27000 rs of 4000 unit .
pls given right information for this mate.

thanks

Sir in room I use 1tube light ND one fan how many unite im using in one day then rply fst

Abhishek Jain (Mod)

It depends on how many hours you use them for. If you do not switch them on then you use 0 units. But if you keep them on for 24 hours, then you use a lot of units.

I am thinking for Solar Power for my House, so could you please guide me tht how much power consume a day based on electronic devices like Fridge, TV, lights, FAN, Washing Machine, Cooler, Water pump, laptop, computer etc....

my house is 3 BHK house.

so my question is how many solar panel I'll require for the same.

Please call me at 8697000196 B Sen Aura Energy

Abhishek Jain (Mod)

Would suggest you to look at this video: This can answer a lot of your questions.

what is the relationship between voltage and wattage,will be happy for the answer.

Abhishek Jain (Mod)

If power factor is 1, Wattage = Voltage x Current otherwise Wattage = Power Factor x Voltage x Current.

Also sir, tell me if all the using things are work properly then how many units will came as per my last question.

Abhishek Jain (Mod)

Your 21 inch TV for 8 hours would not use more than 1 unit.

Cooler for 2 hours would consume about 0.7-0.8 units.

Fridge depending on size should not consume more than 3 units per day (I am not sure about the size and type of your fridge, but any model which is about 500+ litres and double door consumes about that much). And I am sure your fridge would be small, but still assuming on higher side, it should not consume more than 3 units.

fridge model : kelvinator 175ltrs

Abhishek Jain (Mod)

175 lts fridge should not consume more than 2 units of electricity in a day.

Abhishek Sir,I already do this last night but unit still remain. Suggest me is there a fault in meter or there are some additional wire attached with our sub- meter.

Hi Sir, My name Is Ravi Thakur, i live in punjab on ranted room. i have a samsung TV 21inches, a fridge, a cooler. In a single day we used tv for approximatly 8hours, cooler for hardly 2 hours & fridge for near about 18 hours in a day. But our unit came 7-8 unit. we think unit are very high. Please suggest us can 7 or 8 unit are rights as per our uses. Also there are electricity cut 2 or 3 hours in a day

Ak unit me 100w note h

Abhishek Jain (Mod)

7-8 units sounds high but do check your fridge. Sometimes fridges consume a lot of electricity if they are not efficient or are not being used properly. Try switching it off one day and then measure daily consumption.

Hi sir my name is Anil Kumar I am working as a junior engineer in fabric company there is no energy meters show the power consumption my question is with energy meters we can use machine capacity n calculate the power consumption...? Wether it will exact value? If not tell me another way to find out...My email I'd:[email protected]

Abhishek Jain (Mod)

Hi Anil,

It depends on the precision and quality of energy meter. If you get a good meter, you can calculate power of each and every machine running your plant accurately. You can also measure other vital factors like power factor , kVA, kW, kVAH, kWH using a good digital energy meter.

Sorry with out energy meter how can we find our power consumption

Abhishek Jain (Mod)

You just put it between the machine and the power supply. It should get the value for you. If it is a big machine, go for a 3 phase energy meter with CTs.

Sir how much units does an automatic washing machine of 438 kwh will consume with a family of 4 and we have 2 Ac and use it each for 6 hours a day with both 3 star and 1.5 tons ??
Please reply..

Abhishek Jain (Mod)

It is 438 Watts or 438 kWh? Because 1 kWh = 1 unit. And 100 Watts when run for 10 hours consumes 100x10 = 1000 Wh or 1 kWh or 1 unit of electricity.

Naturaal Engineering Solution

Sir, if 2 kw is consumed in 30 minutes. How much unit consumed?

Abhishek Jain (Mod)

2 kW x 0.5 hr = 1 kWh = 1 unit.

Hello Abhishek sir,how to check load in three phase electrical panel on multimeter or clamp meter ?

Abhishek Jain (Mod)

You need a 3 phase energy meter with CTs (current transformers).

How much unit does 8 watts wireless router consumes considering it is on whole month?

Abhishek Jain (Mod)

If you use it for 24 hours then in 24 hours it would consume 8 x 24 = 192 Wh or 0.192 kWh or 0.192 units. If you use it for 30 days, you can multiply that by 30 and get the number.

Raghavendra Goggi

in our utility panel meter is showing 14871.1 kwh ( one month differnec) ct ratio is 200/5 how to convert this into units

Narendra Pandey

how much unit of electricity a geyser of 3000 kwh will consume consume using on an average 45 minutes a in day..?

Abhishek Jain (Mod)

Depend on the volume of hot water you use. It does not depend much on the Wattage of the geyser. Check out this post on our website that explains in detail: http://www.bijlibachao.com/water-heaters/choose-the-right-sized-water-heater-geyser-for-electricity-saving.html

how much unit consume a normal cooler

Abhishek Jain (Mod)

About 250-300 watts which means in an hour about 0.25 to 0.3 units.

iDear Sir,
Capacity of 1.5 Sq mm wires is 15 Amps Max. hence power can utilized more compared to 1 sq mm connecting same load, If i connected same load by using 1 sq mm. power consumes in individual connected energy will less. can I presume that lower the current capacity of wire, higher in savings, electricity.
if not please request to explain, why the users are playing, non standard wires with standard wires. no matter in individual connections Watts of 1 KW lamps will less because of poor amp capacity compared to standard.
If I made same connection with single bench circuit, with single source load, week wire consumes more power compared to standard, even after current flow is lesser than standard wire.
I have made experiment connecting 1 KW- 2 Halogen light in parallel with energy meters,in single circuit, current shows in wire 5.85 Amp,in one and and 2.84 in 2 nd, because of connections in parallel circuit 230 V remains same, and also light intensity, but energy shows more in 2nd week wire connected bench circuits.
As current flows in week wire is 2.84^2 X Resistance losses is low in poor quality wires.

I observed the reading on the meter on the day the electricity dept took the reading. It was at 31640 kwh... the next day night (roughly 36 hours), the meter read 31655 kwh, a whopping 15 units!! We don't have an air conditioner, no geysers. We did not run the washing machine that day. Just 3 fans with usage not more than 10 hours a day, 3 tube lights with less than 10 hours usage, a crt tv with 10 hours usage and a refrigerator running all day. I just used the induction cooker to heat water for around 15 minutes in the morning. How could all this sum up to 15 units for 36 hours? Am i missing something or should I get the meter checked?

Abhishek Jain (Mod)

Hi Vignesh,

Assuming your fans consume 100 watts (worst case), then in 10 hrs each fan would consume 1 unit. So 3 units per day for the fans (max 6 units assuming 2 days). Each tubelight would consume 50 watts (again worst case), then in 10 hrs each tubelight would consume 0.5 units, so 3 tubelights in 2 days would consume 3 units. CRT TV would consume 150 watts, so in 10 hrs it would consume 1.5 units. Again assuming 2 days it would be 3 units. Power consumption of refrigerator would depend on size, technology, etc. But assuming 2 units in a day, in 2 days it would consume 4 units. Induction cooker in 15 mins would consume 0.5 units in worst case. So it totals up to 6 (fan) + 3 (lights) + 3 (TV) + 4 (Refrigerator) + 0.5 (induction) = 16.5 (approx) for 48 hours. This can have some errors as there are approximation and these are not real measurements. Your refrigerator may be a bit more inefficient (or may be big as I have assumed 250 lts old one).

Dear Sir,
I M using Ele cooktop 2000watt 2hour in kitchen and water Heater 2000watt 30 min. Please Tell me My Daily elec Unit Usage

Deepakkumar Singh

4 Unit For Cooktop + 1 unit For Heater = 5 Unit

Sir, my room size is 15x15 feet, i have 2.0 ton 5star rating hitachi A.C ,How many units it will consume in a month and per hour

Abhishek Jain (Mod)

A 2 ton BEE 5 star rated AC would consume about 1.8 units in an hour.

So if i was to use a 5 40w tubes 16 hours a day...i need to sell my vw

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