Calculating usage

dragona

Help, I need to know how much electricity a 25w light bulb uses in an hour, in order to avoid a divorce:D How can I find out??

micks

0.025Kwh @€;0.1776

= €0.0044 / hr

if i got my zero's correct

based on - https://www.sseairtricity.com/ie/home/products/current-offers-2/sse-airtricity-standard-electricity/

dragona

micks wrote: »

0.025Kwh @€;0.1776

= €0.0044 / hr

if i got my zero's correct

based on - https://www.sseairtricity.com/ie/home/products/current-offers-2/sse-airtricity-standard-electricity/

Thanks! How did you figure that one out! I've looked and can't find usage calculator

my3cents

Put it another way it will take 40 hours (1000/25) to use one full unit of electricity at whatever the unit price is on your last bill.

iwillhtfu

How to calculate electric usage cost:

• Volts x Amps = Watts
• Watts ÷ 1,000 = Kilowatts (kW)
• Kilowatts (kW) x Hours of Use = Kilowatt Hours (kWh)
• Kilowatt Hours (kWh) x kWh rate = Cost of Usage

Steve

iwillhtfu wrote: »

How to calculate electric usage cost:

Watts x 1,000 = Kilowatts (kW)

Slight mistake there, fixed your post.

Simpler explanation is a unit of electricity is billed per kWh.

That means 1000 watts consumed per hour.

A 25 watt bulb consumes 25 watts per hour so it costs 25/1000 of a unit per hour.

iwillhtfu

Steve wrote: »

Slight mistake there, fixed your post.

Why? It worked perfectly fine OP's calculation

25 ÷ 1000 = 0.025
0.025 x 1 = 0.025
0.025 x (kWh rate) = cost

Another mod in the electrical forum that holds grudges. Oh joy I knew there was a reason I didn't visit here often.

2011

iwillhtfu wrote: »

Another mod in the electrical forum that holds grudges. Oh joy I knew there was a reason I didn't visit here often.

Do not post on this forum if you can not cope with anyone having the audacity to disagree with you.

micks

iwillhtfu wrote: »

How to calculate electric usage cost:

• Volts x Amps = Watts
• Watts ÷ 1,000 = Kilowatts (kW)
• Kilowatts (kW) x Hours of Use = Kilowatt Hours (kWh)
• Kilowatt Hours (kWh) x kWh rate = Cost of Usage

And Volts x Amps = VA
Not watts

iwillhtfu

micks wrote: »

And Volts x Amps = VA
Not watts

You can't be serious. Really is that the height of your input. Wow there's no hope for some. :rolleyes:

Forget your early calculations there eh.. :eek:

Think triangle and I x A = W (power)

You're welcome.

iwillhtfu

2011 wrote: »

Do not post on this forum if you can not cope with anyone having the audacity to disagree with you.

Disagree by all means I'm usually more wrong more than I am right but please ensure you're correct.

Clearly watts x 1000 is kilowatts but for the purposes of a calculation of kWh cost it makes no sense particular in the calculation I have posted.

2011

iwillhtfu wrote: »

Disagree by all means

I haven't disagreed with anything on this thread.

I'm usually more wrong more than I am right

If you say so

2011

iwillhtfu wrote: »

Think triangle and I x A = W (power)

Really?
Here is that very triangle:

Andrea B.

dragona wrote: »

Help, I need to know how much electricity a 25w light bulb uses in an hour, in order to avoid a divorce:D How can I find out??

OP.Another way;
1000watts or 1KW running for 1hour is a KWHour/KWH (unit cost displayed on your bill).
So, 40 of your 25watt bulbs running for 1 hour = 1KWH or 1unit cost
So, your bulb is costing; 1unit/40.........significantly less than the cost of a divorce.

coylemj

Steve wrote: »

Slight mistake there, fixed your post.

Simpler explanation is a unit of electricity is billed per kWh.

That means 1000 watts consumed per hour.

A 25 watt bulb consumes 25 watts per hour so it costs 25/1000 of a unit per hour.

The unit of energy is a joule, a watt is a rate of energy consumption equal to one joule per second so 'watts per hour' makes no sense.

A 25w bulb consumes 25 joules of energy per second.

A 1000w (1 kW) appliance in one hour will consume 3,600 (seconds in an hour) x 1,000 (watts in a kilowatt) joules = 3.6 MJ (megajoules) = 1 kWh.

dragona

Andrea B. wrote: »

OP.Another way;
1000watts or 1KW running for 1hour is a KWHour/KWH (unit cost displayed on your bill).
So, 40 of your 25watt bulbs running for 1 hour = 1KWH or 1unit cost
So, your bulb is costing; 1unit/40.........significantly less than the cost of a divorce.

Haha I turn it on, he turns it off, and on, and off........ Might just stay on now:D

my3cents

dragona wrote: »

Haha I turn it on, he turns it off, and on, and off........ Might just stay on now:D

I think you are missing the point :rolleyes: ITS THE PRINCIPLE THAT COUNTS! It may only be a small amount of electricity but you can still SAVE it :pac:

dragona

my3cents wrote: »

I think you are missing the point :rolleyes: ITS THE PRINCIPLE THAT COUNTS! It may only be a small amount of electricity but you can still SAVE it :pac:

OMG ARE YOU MY HUSBAND:D:D:D:D:D

Steve

iwillhtfu wrote: »

Another mod in the electrical forum that holds grudges.

I'm not a mod here.