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Old 04-12-2012, 06:22 AM   #16
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Illuminating a Driveway


Quote:
Originally Posted by dmxtothemax View Post
1- If theres 150w at the secondary, then there must be at least 150w at the primary. (actually a little more at primary, to allow for losses).

2 - dc is NOT harder to push thru cable, when compared to ac.
The same rule applies for ac and dc.
And the losses will be the same.

You can always put some extra volts in, if the run is long
and losses are significant.
Not true. There is more resistance to AC current due to the skin effect that causes current to travel primarily towards the surface of the wire.

Mark

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Old 04-12-2012, 08:24 PM   #17
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Illuminating a Driveway


In a system like this IE "60Hz" the losses due to skin effect,
would be so small, it would not even be worth worring about !

It is only significant at much higher frequencies like RF.

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