Gunter
سؤال: Am curious: how can a USB port (which is rated at 5 watt) supply the power to a 12 watt lamp???
السؤال بواسطة Gunter على 2020-01-11 12:04:15
Gunter Didyou notice the different supply voltages between Green, and yellow/red?
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arowland I think you have confused your units. A USB 2 socket can deliver 0.5A at 5V, which is 2.5W. A long way short of 12W! USB 3 raised the current to 0.9A (4.5W) and 3.1 to 1.5A (7.5W), though some fast chargers these days supply up to 2.5A (12.5W), e.g. the sort many tablets use. So make sure you use a suitably rated power supply! A = amp (current), V = volt (voltage, obviously), W = watt (power). W = V x A. It isn't 'fantasy', ilbrunello, it's maths!
2020-09-30 07:13:14 مساعدة (4)