Monitoring power usage


So I've purchased a Maplins power monitor plug to work out which electrical devices are costing how much. See http://www.maplin.co.uk/Module.aspx?ModuleNo8343
For those that haven't seen this before, you just plug this device into a three-pin socket and then whatever you want to test into that. It starts to count the number of kWh being used, straight away.
So I plug in a table lamp with a 60W bulb. Anyway, after 4 hrs the device has measured 0.08kWh (approximately 0.02kWh per hr). So if I'm correct in thinking, after 4 hours the table lamp has only used 80W in total - but its a 60W bulb so shouldn't it be a lot more than that - I don't geddit?
Many thanks if anyone can correct me.
Dunk
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
snipped-for-privacy@rackandruin.co.uk wrote:

It sounds faulty. It should have taken nearly a quarter of a kilowatt hour in that time.
If you have the patience and can switch evertying else in the house off, you can compare it to the electric meter readings..
--
Sue


Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
HI Sue, thanks for the reply. I've actually got two of these monitors (don't ask why!!) and they both come back with similar readings.
I've also temporarily got an Electrisave and that does indeed show that the light consumes approximately 60W of power. However, the electrisave doesn't count in kWh, it just does kw.
See http://www.electrisave.co.uk /
Didn't know if this was something to do with it?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Quite amusing how the 'power save' device consumes 20Wmax itself.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
wrote:

It could be someone is a decimal point out.
Adam
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.