Originally Posted by
droidhacker
Lets be a little bit nicer and explain the units rather than just screaming "WRONG".
Energy is measured in a unit called JOULES (J).
A WATT (W) is the RATE of energy transfer (because energy can be neither created nor destroyed, you can do nothing besides transfer it).
1 W = 1 J/s <--- that is Joule per SECOND, clearly the rate of transfer of energy.
We can play with the time unit a bit to bring it to HOUR....
1 W = 60 J/m
1 W = 3600 J/h <--- now we can see what a watt is in terms of HOURS.
To picture this best, imagine a boat that has been sitting in the rain. It is partly full of water (Joules).
So you can think of JOULES in similar terms as "gallons of water".
Now you have a bucket, you need to empty that water out, so you hop in the boat and start bailing. You scoop up that water and pour it over the side of the boat.
How much time does it take you to bail out all of the water from the boat? That's WATTS. How fast you transfer that water out of the boat.
Moving those units around a little bit to give another familiar unit, we can see something like this;
1 W x 1 h = (3600 J / h) x 1h
1 W.h = 3600 J <--- 1 WATT-HOUR = 3600 JOULES.
When you pay for electricity delivered to your home, it is usually charged per KILOWATT-HOUR. kWh. This is just a convention to make the units look more familiar with respect to things like light bulbs and stove burners, which are described in watts, than it would be if measured in Joules.
1 kWh = 3,600,000 J <--- 1 kWh equals 3.6 million JOULES.
NOW, the inapplicable unit in question... W/h.....
W/h would be J/h/h <--- Joules per hour, per hour. This would be a RATE OF CHANGE OF RATE.
So for example, you have a rain barrel that drives a turbine. The deeper the water is in the rain barrel, the more pressure it outputs, and therefore the more energy you can transfer out of the turbine. Starting with an empty barrel, your transfer rate is 0 W. But it is raining, and filling your barrel at a rate that you measure to increase your energy transfer rate by 2 W/h.
After it has been raining for 1 h, the water is deep enough to transfer 0 W + (1 h x 2 W/h) = 2 W.
After it has been raining for 2 h, the water is deep enough to transfer 0 W + (2 h x 2 W/h) = 4 W, ****OR**** 2 W + (1 h x 2 W/h) = 4 W, depending on whether you are adding one incremental hour, or calculating from the start.
3 h --> 6 W,
4 h --> 8 W,
etc.
If you want to run a 60 watt light bulb off that, you're going to need a pretty tall barrel, and wait 30 hours for it to fill deep enough to generate enough pressure.