# What is the running cost per hour for a 100 watt appliance?

Hi what is the running cost per hour for a 100 watt appliance

Hi what is the running cost per hour for a 100 watt appliance

## Comments

0.1 kW for 1 hour = 0.1*1 = 0.1 kWh

0.2 kW for 1 hour = 0.2*1 = 0.2 kWh

0.1 kW for 2 hour = 0.1 * 2 = 0.2 kWh

0.2 kW for 0.5 hour= 0.2 * 0.5 = 0.1kWh

At, say, 13p per kWh, the cost is 0.1 * 13 = 1.3p

The supply of energy is charged on the basis for every 1 kilowatt of power (1000 watts) or 1 unit.

Luckily electricity is supplied in measured in watts, and thus if an appliance uses 100 watts an hour, then calculations as the above describe as (100 watts/1000 watts) * unit rate = cost per hour

for gas it is measured in cubic feet (cft)or cubic meters (cm), and there is a little conversation need to get 1 kilowatt or 1 unit. and the conversation rate from cft or cm is dependent on many factors, however, typically for every:

1 cft = 31.6586 Watts

1 cm = 11.1868 watts

Power = Kilowatt (kW)

Energy = Kilowatt-hour (kWh)

There is no such thing as energy "for every 1 kilowatt of power" and it makes no sense to say "if an appliance uses 100 watts an hour".

The correct answer is what I posted above and everything else so far has been wrong.

Your calculation is correctly written with units:

(100 Watts * 1 hour) = 100 Wh

100Wh / 1000 = 0.1 kWh

0.1 kWh * (pence/kWh) = pence

You've now said " energy is charged kilowatt per hour". That's also wrong.

It's not kilowatt per hour (kW/hour). It's kilowatt-hour (kW*hour). They are very different things! It's essential to understand the correct units in order to correctly calculate cost.

Likewise "1 cft = 31.6586 Watts, 1 cm = 11.1868 watts". This is kWh. Not just watts. Wrong units and wrong order of magnitude. Plus you failed to mention that 1 imperial gas unit it typically 100s of cubic feet, not 1 cubic foot. Only by luck rather than intention! If the OP had asked how must it cost to run for 2 hours, then your calculation wouldn't work because at no point do you include time in your equation. So your answer is "just wasting everyone [sic] time".

This is, after all, an energy company's forum, so what better place to banish misinformation and establish the facts, so long as discussions are conducted in a polite manner with no personal insults.