Ohms Law is one of the things this can help with…
What do you think this is a close-up picture of?
Hint: AC or DC, just turn the dial.
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Colophon
Macro Photo: Nikon D90 with AF-S Micro NIKKOR 105mm 1:2.8G lens. ISO 1800 f8 at 1/125 sec.
Full Photo: Nikon D90 with AF-S Micro NIKKOR 105mm 1:2.8G lens. ISO 2500 f8 at 1/125 sec.