[mythtv-users] Comcast rendering my HDHR useless
markknecht at gmail.com
Mon Nov 10 23:01:47 UTC 2008
On Mon, Nov 10, 2008 at 2:36 PM, Raymond Wagner <raymond at wagnerrp.com> wrote:
> Wookey wrote:
>> On 2008-11-10 15:40 -0500, Raymond Wagner wrote:
>>> Even kWh is a meaningless term unless you give a time frame.
>> No it's not - it's a measure of energy. It's what you buy power from
>> the power company in. 5kWh will run a 1kW device for 5hours , a 500W
>> device for 10 hours, a 10W device for 500 hours etc. It works for hot
>> water and electricity and eny other energy you wish to measure.
> For claiming the cost of operation of some device, energy usage is
> meaningless. You must give it in terms of power (energy use per second,
> energy user per month, energy use per billing period). You must specify
> a time frame.
No, Wookey's correct. kWh is the way the power company sells power and
it is a reasonable way to determine usage costs at home. The problem
with defining power/time period is that devices don't use constant
amounts at all times and many devices are turned off. Understanding
kWh values is a good way to get around that and equates nicely with
thevalues given on my power bill.
I use a Kill-a-watt measure to get my values. 3kWh/day for my refrigerator, etc.
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