Watts it cost? Help needed so I can Volt thic block in my knowledge.

[Finless]

Reading through my school physics notes ladt night and, sob, all the chalk has been wiped off my slates.

So, my question is about working out the cost of running electrical appliances.

1. I assume that (at work now so can't check) that on the electricity bills it tells you hoy much get charged - in the form of watts per hour (or at least some standard that can be converted to watts per hour)?

2. Running a 100 watt bulb for 1 hour would cost 100 x the value from point 1.

It's something like this. Any swots out there?

[kath2407]

Tend to be measures in kilowatts per hour i.e. 1000 watts so it would be 10 x 100 watt light bulbs for an hour.

K XX

See I'm of use for something!!!

[Janos]

Electrickery is billed in kilowatt-hour (kWh) each kWh costs around 5p (or it did - I may be a bit out of date now).

Appliances have a power (Wattage) rating. For example, most kettles use around 1 kilowatt. So if you run a kettle for one hour you will use 1 kWh of electrickery.

Similarly a 100W lightbulb is 0.1kW, so if you run it for 3 hours you will have used 0.3kWh, or about 1/7th of a penny.

Laters,
Janos

[Finless]

I have just noticed my Freudian phonetically correct misspelling in the thread title - FFS.

[Finless]

Not every electrical appliance has the kW per hour figure on it. How do you calculate this from the info given?

eg My PC monitor is - 100-120V ~ 50/60Hz
1.8A
130W

???

[turbanator]

Originally Posted by Finless

Not every electrical appliance has the kW per hour figure on it. How do you calculate this from the info given?

eg My PC monitor is - 100-120V ~ 50/60Hz
1.8A
130W

???

100-120v ??

Anyway, Power (in watts) = V(volts) x I(Amperes)
AC is a bit different, especially with inductive or capacitive loads.

[Finless]

Originally Posted by turbanator

100-120v ??

Anyway, Power (in watts) = V(volts) x I(Amperes)

It's a bit awkward to see round the back of my monitor. I must have read the European option? There is another label that says:-

200-240V~50/60Hz
1.0A

AC is a bit different, especially with inductive or capacitive loads.

Really. That is very interesting + what does it mean!

Because I'm bored I have decided to go round and cost every electrical appliance I own and then prove whether or not I am being drastically overcharged by the supply Company.

[turbanator]

Originally Posted by Finless

It's a bit awkward to see round the back of my monitor. I must have read the European option? There is another label that says:-

200-240V~50/60Hz
1.0A

That's be it then.

Originally Posted by Finless

Really. That is very interesting + what does it mean!

That if you plot a sine wave for volts and one for amps, they may not always line up. So if you measure them both at the same time V x I will not equal the
Max V x the Max I

Originally Posted by Finless

Because I'm bored I have decided to go round and cost every electrical appliance I own and then prove whether or not I am being drastically overcharged by the supply Company.

I did this once, and then dug up the garden to make sure that there were no leaks in the wire. It was then I discovered that the wire also went to my neighbours' houses. Thoses conning b'stards at Seeboard were selling us all the same electricity!!!

[Janos]

Current in the wires goes from -340V to 340V 50 times a second. The Root-Mean-Square average of this is 240V.

You can use this to calculate the Wattage directly by multiplying it by the Current. So 240V times say 2 A = 480W so approximately 0.5kW

Your monitor running for 3 hours is 240V x 1A x 3h = 720Wh =0.72kWh = around fourpence.

laters,
Janos

[Finless]

Originally Posted by turbanator

That's be it then.

That be watt then? What's the kW/hr figure?

I know I'm stupid. Everyone else knows I'm clueless. Don't make me work it out, just give me the answer!!!!

PLEASE!