Power consumption of idle iPhone charger?
I've been reading horror stories about how these little chargers, just plugged in and not charging, are "power vampires" and think it is nothing but hyperbole.
Who knows the correct power consumption of this little charger (Model A1265) that came with the iPhone 4? Not charging, not even plugged into a charged iPhone, but just plugged into the mains and idling? It does get a bit warm, so there must be some power consumption. But how much is it really?
Thank you.
Further on that, I just found an older thread with the same question, where Tamara claimed her Watt meter (KillAWattz?) indicated zero. That is odd, as the little charger does get warm when left in without it charging, and if it gets warm, there is energy being consumed. Might be very, very little, but who knows how little?
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Has anyone asked Apple directly about this?Hi there Apples or Pears,
I would recommend taking a look at the troubleshooting steps found in the articles below.
Charging your iPod battery
http://support.apple.com/kb/ht1384
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http://support.apple.com/kb/ta44551
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Understanding iPhone Charging and Power Adapters
I've been in a protracted discussion (now locked) regarding iPhone battery charging and whether it is harmful/helpful to use the iPad power adapter rather than the iPhone power adapter.
There are a lot of misconceptions related to iPhone charging and current ratings on the iPhone and iPad power adapters. As an electrical engineer, I'd like to clear up some misconceptions.
Apple supplies a power adapter, not a "battery charger," with the iPhone and iPad.
The iPhone power adapter supplies a constant 5V at up to 1A (rated–independent tests have shown that it can supply almost 1.8A).
The iPad power adapter supplies a constant 5V at up to 2 or 2.1A (rated).
The iPhone's battery charging voltage and current are regulated within the phone.
The iPhone's battery is rated at 3.7V. Charged with the raw 5V from the power adapter, it would be destroyed. Fortunately, the internal regulation in the iPhone prevents that.
The maximum current that an iPhone will draw from a 5V power adapter is right around 1 amp. It does not matter if the charger is capable of supplying more, that's the most that the iPhone will use.
Because of the internal charge regulation, the iPhone battery will not charge any faster on an iPad power adapter than on an iPhone power adapter.
Apple approves the use of the iPad power adapter with the iPhone. It is completely safe for that purpose and does not harm the phone or battery in any way.
A water analogy might make this much easier for people without electrical engineering background to understand.
Water pressure (psi) is analogous to voltage.
Water flow (gallons per minute) is equivalent to current flow (amps).
A faucet valve is analogous to the iPhones battery charging regulation circuitry.
A bucket's capacity (gallons) is analogous to a battery's capacity (amp-hours or AH).
Let's say you adjust the faucet to flow 1/10 of a gallon per hour. The five gallon bucket will take 50 minutes to fill up. Easy enough. But then...
You need a lot more water flow for a new sprinkler system.
You need a lot more current for your new iPad.
Since the water pressure is constant at 80psi, the only way to get more flow use a bigger supply line.
Since the voltage is constant at 5V, the only way to get more current is to use a higher current power adapter.
After installing the new higher capacity water supply line, you go out to your faucet and adjust it to 1/10 of a gallon per hour.
After plugging in the higher capacity iPad adapter, you plug in your iPhone and its charging regulation circuitry adjusts the current flow to about an amp.
The bucket still takes just as long to fill up.
The battery still takes just as long to charge.
The faucet is not under additional strain since the pressure is still 80psi.
The iPhone's battery charging circuitry is not under additional strain since the supply voltage is still 5V.
I hope that I've clarified this for those who want to better understand the subject.As far as the battery status, the tiny little icon in
the upper right corner of the screen is somewhat
helpful, but while it is connected it does not
actually indicate the level of the charge or that the
Iphone is charging. I was hoping to find a more
informative screen that would give better battery
details. When you first connect the iPhone sometimes
I get a large battery icon that shows the level
visually Is there a way to navigate to this screen?
1. Press the top button to turn the display off if it's not off already.
2. Connect to a power source.
3. The screen should display a large battery meter in the middle of the screen that actually shows the state of charge, even if charging.
If you don't see this plugged into your Mac try the AC adapter that came with the phone. If you still don't see it take it to an Apple store.
best,
Larry
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My iPhone charges normally trought power outlet, But it won't charge or recognize trough USB connection on my MacBook, even in restore or DFU mode.
Please help me! I'm stuck on restore mode.I tried on 3 different MacBooks, it doesn't work.
I have some updates though... It is recognized on my car sound system, and It is working fine when connected to a windows PC, I was able to normally activate it... so the problem is not on the connector, Macs just don't recognize it.
Anyone ? -
Idle power consumption in arch twice as high as Windows 7?
I have some issues with power consumption in Linux.
Here's the rough setup:
i5 750, stock settings
Asus P7P55D-E premium
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Last edited by clesch (2010-05-19 11:10:33)lymphatik wrote:
demian wrote:
Well, there's not much left, is there? It pretty much has to be the 5770.
You could install powertop though, to verify if the p and c states get used correctly.
Yes it is likely but you should verify to be sure.
I would if i could. You probably want to address clesch instead of me . -
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is it bad to connect my iphone charger to the phone THEN i plug in the charger to the power outlet? would it mess up the battery?
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iphone 4 was charged and suddenly stopped work went dark, Will not power back on, will not charge. Any suggestions on cause or fix???
Hi daj1202,
That definitely doesn't sound good. Lets see if we can isolate this issue further:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
Will not turn on, will not turn on unless connected to power, or unexpected power off
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIs and corrosion.
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The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.
If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.
If the display turns on, go to step 4.
If the display remains black, go to next step.
Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article for further assistance.
If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
Thanks,
Matt M. -
HT3559 iMac 20" 2008 power consumption off, sleep, idle?
Where can I find specifications for power consumption for older Macs?
Oops! I found some answers here. Though the archive is missing many machines, and specifically the 2008 iMac that I'm looking for http://images.apple.com/environment/reports/
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We operate tens of macbooks at our campus for student loans. We are trying to cut on the power consumption of the loans operation. I am interested to know how much power does the power brick consume when:
a) nothing is connected to the MagSafe jack.
b) the macbook is fully charged and the LED is lit green.
Please don't guess or think! give me a firm answer if you know. I appreciate that!I pulled out my 1940s era General Electric Wattmeter. This is a two-coil instrument that measures Vrms * Irms * cos( phase angle) = actual Watts. This type of meter does not measure reactive power that does not deliver energy to the load but circulates in the system. Reactive power is a concern because the out-of-phase current of reactive power does cause energy loss (I squared R loss) by heating the wires carrying the current.
Power brick energized, but not attached to computer - unmeasurable.
Power brick energized, attached to computer, green LED on - about 0.7 Watt.
Power brick energized, attached to computer, OSX booted, but idle - 8 to 10 Watts.
Power brick energized, attached to computer, screen saver running - 8 - 12.5 Watts.
Power brick energized, attached to computer, 5th Element DVD playing - 12.5 -15 Watts.
Power brick energized, attached to computer, Grapher, contours.gcx - 18.5 - 20.5 Watts.
Once in a while, I could get the MacBook to peak at about 25 Watts (averaged by the mechanical dynamics of my meter) of power consumption. The initial plug-in of the power pack to the socket also consumes several amps for a split second - too hard to measure accurately with my crude equipment. There's also a little audible crack! as the prong touches the outlet, so it is obviously a pretty large momentary in-rush of current.
When the power brick is unplugged, the Irms current draw is about 22 mA according to my Fluke 8060A. Presumably that's almost all reactive at close to -90 degrees phase angle relative to the voltage. Switch mode power packs like the MacBook's tend to be capacitive loads. That's about 2.64 VARs of reactive power.
When the MacBook is idling at about 9.5 Watts of real power consumption, the current draw is about 245 mA. The real power corresponds to about 70 mA of in phase current. This gives the surprising result of about 234 mA of lagging reactive current.
In terms of what real-world thing can you do? For 10 to 100 MacBooks, I don't belive it is worthwhile to do anything. Probably remediating the power supply to reduce the reactive current load would be good thing. At industrial scales, factories worry about current phase angle a lot. Power providers bill for reactive current they have to generate, otherwise they would lose revenue by heating their transmission lines, but the customer gets no energy delivered to the manufacturing process by the out-of-phase reactive current.
Probably, the energy consumed and eventual environmental waste generated by remediating 10-100 power supplies, not to mention the engineering hours required, would not offset the power that would be saved over the useful life of the MacBook.
On the other hand, grumbling at Apple to contract with the manufacturer for a greener design for the power pack for the many thousands of users would be a good thing on which to expend a little energy.
PS: just to be sure my Wattmeter is giving reasonable results, I plugged in a "60 Watt" bulb that's been used for about 200 hours. According to the meter, it draws 58 watts.
Bill
Message was edited by: impulse_telecom
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