If this question is about electrical home heating then use ten watts per square foot.
To obtain amps from watts a voltage must be given.
hair straightener uses 1500 watts
watts Divided by Volts = amps
about 3~5miles Once you get the 3 watts how will you get them home would be the next question.
Light intensity or irradiance
There are 746 watts per HP, its just something you have to remember.
There is none. Electricity and miles per hour do not relate.
40 Joules, I think, as the formula for Watts is Joules/Second = Joules per second 40 Watts should equal 40 Joules per one second...
46.6 watts an hour.
Watts is voltage (in volts) x current (in amps)
The formula for watts is, Watts = Amps x Volts.
.Amplifier power is measured in watts, as in "100 watts per channel," but what does that really mean? Do all 100 watt per channel receivers deliver 100 watts? And what about those "1000 watt" home theater in a box systems? Are they more powerful than 2,000 A/V receivers? And what about high-end 100 watt per channel high-end power amps? Are all watts created equal? I don't think so!
Power is the amount of energy used per unit of time. In the SI system its units are Watts = Joules per second.
You need the formula: Amps * Volts = Watts But you get to do the math.
volts times amps equal watts, or 550 lbs per sec equals 1 horse power.
Typically the power rating of a sub-station is in Watts. A standard transformer may be 55kva or 55,000 volt amps. Volt amps is the formula for Watts. (V times A equals Watts) Standard home usage is in the neighborhood of 3kw per hour. So a sub-station with three 55kva tranformers might handle 60 homes.
The formula you are looking for is I = W/E. Amps = Watts/Volts.