How to calcalate the cost of electricity in appliance?

[kelvin1704]

I need to calcalate the power savings between CRT and LCD.

Can anyone teach me how to calcalate it?

If we assume we use the LCD screen 10 hours a day.
LCD screen rated max consume 25W.
CRT screen rated max consume 100W
No idea how much does Electric Cost... any figure would do. (My main question is actually electricity cost. Its ok if it varies from the place i live in. I just need an idea) thanks

How do I calcalate a day cost of electricity?

thanks

 

[rgwalt]

Get ahold of your last electric bill and they will show you the cost per kWhr. You compute the kWhr usage by taking the number of watts the appliancce uses, divide by 1000 to get the number of kW the appliance uses, and the multiply by the number of hours the appliance is used. So, the LCD screen would consume 0.25 kWhrs per day while the CRT would consume 1.0 kWhrs per day. Multiple this by the number of days per billing cycle (30 on average) and then multiply by the cost of the electricity pulled off your electric bill.

Done.

GL.

Ryan

 

[kelvin1704]

0.25 kWhrs per day?

Meaning if the cost per kW is 1 dollar. The cost of the LCD power consumption is only 0.25 cents? Its per day or per hour?

thanks

 

[kelvin1704]

anyone?

 

[Stang46]

Yes that is correct. Generally, the price for one KWhr is somewhere around $0.07-0.10, go check your power bill for your exact price.
So basically here is your cost per DAY:

LCD:

[0.025 kW]*[24 hr][$0.08/kWhr] = $0.05 ($18.25 per year)

CRT:

[0.100 kW]*[24 hr]*[%0.08/kWhr] = $0.19 ($69.36 per year)

 

[Viper GTS]

OK...

A Watt is a measure of power. A watt*hour is a draw of one watt for one hour. A kilowatt*hour is a draw of 1000 watts for one hour.

If the LCD draws 25W (or 0.025kW), using it for one hour would result in 0.025kW*hours of power consumed. Multiply that times 24, then times 30, then times the cost per kilowatt hour.

That is the cost of using it 24/7 for one month.

Viper GTS

 

[Stang46]

-

 

[rgwalt]

Originally posted by: kelvin1704
0.25 kWhrs per day?

Meaning if the cost per kW is 1 dollar. The cost of the LCD power consumption is only 0.25 cents? Its per day or per hour?

thanks

In one hour the LCD would consume 0.025 KWhrs of energy (power * time = energy). In your post you assumed that the LCD would be on for 10 hrs per day. So, 0.025 kWhr / hr * 10 hrs/day = 0.25 kWhr / day.

Multiply that by your cost per kWhr ($/kWhr) and then the number of days in a month and that comes up to the cost of running the LCD for 10 hrs/day for a month.

Ryan

 

[kelvin1704]

I am not sure I understand or not.

I just called our electric company. I am not sure they fully understand my question or not. Basically what I got from them is that 1 KWH cost 0.288 cents for business.

So in that case, does it means:
0.25 * 0.288 = 0.072 (Cost for one day)
0.072 * 20 days = 1.44 dollars for a month (20 days per month)

Is that right?

ps: its KWH that they said, not kWhr

 

[rgwalt]

Originally posted by: kelvin1704
I am not sure I understand or not.

I just called our electric company. I am not sure they fully understand my question or not. Basically what I got from them is that 1 KWH cost 0.288 cents for business.

So in that case, does it means:
0.25 * 0.288 = 0.072 (Cost for one day)
0.072 * 20 days = 1.44 dollars for a month (20 days per month)

Is that right?

ps: its KWH that they said, not kWhr

First, kWhr is the same as KWH

Ok, one more time... you have an LCD that draws 25W to operate. You are going to operate this LCD for 10 hours/day, 20 days/month. Electricity costs $0.288/kWhr (all info taken from your posts)

So, your LCD draws 25W * 1kW/1000W = 0.025kW

In one hour, your LCD will use 0.025kW * 1 hr = 0.025kWhr

In 10 hours, your LCD will use 0.025kWhr (per hour) * 10 hr = 0.25kWhr (per day)

At 10 hours per day, in 20 days, your LCD will use 0.25kWhr (per day) * 20 days/month = 5 kWhr (per month)

At $0.288/kWhr, your LCD will cost $0.288/kWhr * 5 kWhr (per month) = $1.44 per month

Got it?

Ryan

 

[kelvin1704]

Got it loud and clear.

Thanks man..

 

[Cyberian]

I just called our electric company. I am not sure they fully understand my question or not. Basically what I got from them is that 1 KWH cost 0.288 cents for business.

I think you should verify that figure.

0.288 cents per KWH is unbelievably cheap.
I'm paying about 12 cents here.

 

[rgwalt]

Originally posted by: kelvin1704
Got it loud and clear.

Thanks man..

No problem. Glad I could help.

Ryan

 

[kelvin1704]

Originally posted by: Cyberian

I just called our electric company. I am not sure they fully understand my question or not. Basically what I got from them is that 1 KWH cost 0.288 cents for business.

I think you should verify that figure.

0.288 cents per KWH is unbelievably cheap.
I'm paying about 12 cents here.

Thanks for your concern. Actually, I am not in US. I am in Malaysia now. The electricity here is very cheap. Futhermore, 0.288 cents are in Ringgit. If it convert to US dollar, its 0.075 cents per KWH.
I can be wrong if the person I spoke to the phone misguided me. I spoke to the Electric company. (She might be wrong)

 

[Cyberian]

Originally posted by: kelvin1704

Originally posted by: Cyberian

I just called our electric company. I am not sure they fully understand my question or not. Basically what I got from them is that 1 KWH cost 0.288 cents for business.

I think you should verify that figure.

0.288 cents per KWH is unbelievably cheap.
I'm paying about 12 cents here.

Thanks for your concern. Actually, I am not in US. I am in Malaysia now. The electricity here is very cheap. Futhermore, 0.288 cents are in Ringgit. If it convert to US dollar, its 0.075 cents per KWH.
I can be wrong if the person I spoke to the phone misguided me. I spoke to the Electric company. (She might be wrong)

Wow - I still think that you should reaffirm your rate for elecrticity. I am not familiar with the exchange rate for Ringgits, but that still sounds terribly cheap by US standards.