Anyone got a power meter and a few minutes?

[Burnsy2023]

I'm curious to find out how much power a mobile phone charger draws when charging a phone in mid cycle (rather than trickle charging). Anyone got a power meter and can give me some readings?

 

[Cosimo]

My Galaxy Nexus on 63% charge:

0.048 Amp and 7.2 Watt​

 

[Burnsy2023]

Thanks dude. Any more so I can get an average?

Also, how long does it take to fully charge the phone?

 

[Cosimo]

Thanks dude. Any more so I can get an average?

Also, how long does it take to fully charge the phone?

I've left it on but there shouldn't much change. It will probably take over an hour to finish the charge.

 

[Deleted member 66701]

My Galaxy Nexus on 63% charge:

0.048 Amp and 7.2 Watt​

Something is wrong there. 0.048 amps @ 230v is 11 watts. Is your charger for the Gal Nex rated @ 5v @ 1A?

 

[lurkio]

power factor correction ?

 

[Nazbit]

I've got 135 watts on a socket charging two phones, both at about 2/3rds.

Cant vouch for the accuracy of the meter though, it was free from a website promotion, could be a random number generator for all I know about electronic things!

 

[Mike1983]

Iphone 3GS - 0.02A / 4W

 

[Burnsy2023]

I've got 135 watts on a socket charging two phones, both at about 2/3rds.

Cant vouch for the accuracy of the meter though, it was free from a website promotion, could be a random number generator for all I know about electronic things!

That does sound very high. Most laptops won't draw that much.

 

[Cosimo]

Something is wrong there. 0.048 amps @ 230v is 11 watts. Is your charger for the Gal Nex rated @ 5v @ 1A?

power factor correction ?

The charger is 5V @ 1.0A output.

Now using 0.045 amps with a power factor of 61 and at 6.1 watts.

The phone is now 84% charged.

 

[Yamahahahahaha]

I've got 135 watts on a socket charging two phones, both at about 2/3rds.

Maybe 13.5 watts?

 

[Nazbit]

Maybe 13.5 watts?

Thats interesting, there is no decimal point on the display, but as there are two phones charging that would make them around 6.75 watts each which is comparable with other peoples readings.

 

[Jonny69]

Something is wrong there. 0.048 amps @ 230v is 11 watts. Is your charger for the Gal Nex rated @ 5v @ 1A?

230V AC though, not DC. RMS power is about 7W if my GCSE physics is right.

 

[Dr.EM]

The 230V value is the RMS line voltage. Line voltages are always given as RMS (DC equivalent). Presumably the current is also RMS and so the power would be around 11W, however as others have said there may be some PFC.

135W would be outrageous for a couple of mobile phones! Imagine how hot they'd get if this was true, they'd scorch your desk at the very least (unless they were superconductor engineered and charged fully in about a minute!). It is either 13.5W or a totally bogus meter.