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Posted by tom on October 10th, 2003 09:13 AM
In reply to OK by Tom on October 10th, 2003 08:54 AM [Go to top of thread]
I'm an electrical engineer, trust me I know what I speak of.
The transformer's capacity is what you were asking about. If the rating is 300 VA that means that it can safely supply 300 volt-amps (watts) - this doesn't mean you're using 300 watts, it just means that it can be supplied.
The primary side of the transformer is 110Vrms input, so your 300/110 = 2.7 Amps is correct, but remember, it's a "step down" transformer and the conservation of energy tells you that the input power is equal to the output power. so if you're pulling (for instance) 20 watts on the input, you're putting out 20 watts on the output.
Note: I'm not taking into account eddy current losses or parasitics etc, i'm assuming an ideal transformer.
"low voltage lights" means that the voltage is low, and it is, 12 Volts is tiny, it has nothing to do with power. IF they drew 10000 amps they would still be low voltage, but HIGH power.
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