15A is a lot at 120 or 240VAC. For 120VAC, that’s 1800W.
Most things we plug in are DC. For DC, W = A * V. Your phone probably charges around 5V 3A, which is 15W. You could plug over 100 times that into a 15A power strip.
When going between AC and DC, the wattage will be the same, or close enough considering losses from heating during the conversion.
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