Quote:
Originally Posted by rodcrux
Clearly marked 500 OHMS on each of the two coils.
(Yes, there is continuity between the terminals at 1000 OHMS resistance)
As a matter of caution- I saw one of these bells in auction described "Door bell 220 volt Albert Pernet - Paris"
Really? 220 volt ?  |
Well, let's do a bit of arithmetic.
On the assumption that the impedance of those coils will be almost resistive - i.e. 1000 Ω, then when connected to 220-v.a.c., the current will be 220 รท 1000 = 220 mA. The power will be 220 x 0.22 (watts) = 48 watts (approx.). I do realise that that power - mainly as heat - will be dissipated for a very short time, but still seems excessively high to me. Perhaps the reactance of the coils is not negligible, especially if it is intended to be used with a supply freq. less that 50 Hz?
Al.