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A Shot in the Dark: A Creative DIY Guide to Digital Video Lighting on (Almost) No Budget by Jay Holben

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It’s All About the Amps

Unless you’re getting into designing electrical circuitry or large distribution, you can forget about ohms—they don’t have any bearing on your practical work. Watts are easy, because the wattage for any given device is always a constant. A 75W bulb will always be a 75W bulb, no matter where you use it. Wattage doesn’t change. Voltage is, for all intents and purposes, also a constant. In the US, that voltage is 120V. Remember, as I said before, voltage does vary in any given circuit and can be anything from 100V to 130V at any given moment and not adversely affect most components powered on that system. Fluctuations beyond that can be damaging to whatever is connected to that electrical service. Most residential and commercial ...

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