Timeline for Will 2 multi-port USB chargers overload a 13A socket?
Current License: CC BY-SA 3.0
7 events
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| Sep 30, 2015 at 15:58 | comment | added | Johnny | I have that same brand of charger in a 4 port model and it remains quite cool to the touch (just slightly warm) even when charging tablets in all 4 ports so I think the current rating is just being conservative or maybe some short term peak value... I'm certain its not wasting half the power as heat. | |
| Sep 30, 2015 at 5:55 | comment | added | Craig Tullis | @Ecnerwal plenty of these types of transformers get plenty hot. There have been recalls of certain laptop computer power cord transformers because they'd occasionally get so hot they'd melt and/or catch on fire, or ignite whatever they were sitting on. | |
| Sep 30, 2015 at 2:15 | comment | added | Ecnerwal | Perhaps that bad, but probably not quite. Note that the input voltage is given a a range from 100-240V, but the current is simply given as a single (probably maximum) value. It likely draws 1.4A at 100 V when fully loaded, and less than that at higher voltages. But that's still less than 50% efficient at 140W in and 60W out. If it is dumping that much power as heat, it will get quite hot to the touch. It's also hard on the power bill. | |
| Sep 30, 2015 at 1:14 | comment | added | kizzx2 |
Assume 220V input voltage. 1.4A * 220V = 308W that means the transformer loses 1 - 60W / 308W = 80% of the energy (to heat, likely). Is that correct?
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| Sep 29, 2015 at 16:34 | history | edited | Tester101 | CC BY-SA 3.0 |
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| Sep 29, 2015 at 16:28 | history | edited | Tester101 | CC BY-SA 3.0 |
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| Sep 29, 2015 at 16:21 | history | answered | Tester101 | CC BY-SA 3.0 |