Door Bell Transformer
On 24/02/2014 21:14, Bill Wright wrote:
harryagain wrote:
The other good news is that they use electricity all the time.
Whereas a battery operated doorbell only uses power when a finger is
on the button.
So how much does 1kWh cost if you get it from AA cells?
Most small transformers consume a few watts, say 5? Given there are
8,700 hours a year that equates to 43.5kWHrs, which at 10p per unit
would be roughly £4.35
That pays for quite a few alkaline batteries at Poundland. Plus
batteries don't "buzz" in the bedroom above.
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