The electricity drained by a device

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9
votes
8answers
11k views

How can I avoid my MacBook Pro giving me minor shocks?

The aluminum Macbook Pro gives a mild shock when connected to a wall socket and charging. It only happens when I'm, for example, not wearing shoes or slippers and my feet are resting on the ground ...
0
votes
2answers
31 views

How to pack MagSafe cable to prevent its breaking?

I am looking for a (most) powercord-safe way to pack my MagSafe adapter for a daily backpack commute. Official Apple recommendations (as illustrated by third-party videos like this) don't prevent the ...
0
votes
2answers
762 views

Where are the power-on jumpers on a mid-2013 MacBook Air logic board?

I'm trying to locate the power-on jumpers on the logic board of mid-2013, 13" MacBook Air. Similar to this question, but for the newer model MacBook Air. I have disassembled and cleaned all ...
0
votes
1answer
9 views

Is the MacBook Pro Retina (Old Version) meant to come with an extension cable?

Is this Apple MacBook Pro ME665LL/A 15.4-Inch Laptop with Retina Display (OLD VERSION) meant to come with an extension cable to plug into this charger (link below). This is the cable I think is ...
2
votes
0answers
13 views

The power button turns MacBook off, but not back on

I have: replaced/soldered a new keyboard connector on the logic board as it had a missing pin, replaced the keyboard twice (the second and third keyboards work correctly), tried jump starting the ...
0
votes
2answers
2k views

Stop MacBook Pro from disconnecting network while downloading larger files

I am using a Gigabit Ethernet adapter (Apple) to connect to my network. While downloading larger files the MacBook Pro blanks the screen and disconnects the network even though it is active doing the ...
0
votes
0answers
10 views

Mavericks: pmset ChargeInhibit

I'm running Mavericks on a mid-2012 Macbook Pro. I read that in Mac OS X 10.6 pmset could be used to prevent the battery from charging. I've been using my Mac with AC power a lot lately and I thought ...
2
votes
2answers
539 views

Can I charge my Samsung Omnia W with MacBook Pro USB port?

Currently, I am using a Samsung Omnia W and mostly I am using my MacBook Pro's USB port for charging it. Is it fine for charging the battery in the mobile phone? Sometimes, I have received a 'high ...
1
vote
1answer
37 views

SSD in a 2012 17" causing GPU failures?

Just got my MPB back from Apple after taking it in with GPU overheating glitches. Apparently this model (2012) are prone to it and it's been exhibiting all the symptoms. Blue screens, grey screens, ...
1
vote
1answer
3k views

How much power does Apple TV use on standby?

I just bought a third-gen Apple TV, and I don't want to have to open Settings to put it to sleep every time I'm done using it. It seems it won't fall asleep automatically for quite some time, so I'd ...
0
votes
2answers
30 views

Does a driver exist to step up a PC USB 3.0 port to charge an iPad at 12W?

The iPad Retina requires 12W to charge. It appears the Mac has special non-usb-standard drivers that step up the USB 3.0 port to provide the extra power for charging. My question is: Does a driver ...
5
votes
2answers
24k views

Is it safe to use my US iPhone/iPad charger with a simple European plug adapter?

I'm using the US wall adapter that came with my iPhone to charge it: When I travel to Europe, is it safe to use this with a simple US-European adapter, or do I need a transformer or some other ...
3
votes
1answer
596 views

Why do I have to reboot my iMac and Wacom Cintiq after sleep?

I have an iMac and a 24 inch Wacom Cintiq. When I put the iMac to sleep, it freezes and I have to restart both the iMac and the Wacom Cintiq. How can I get around this?
2
votes
2answers
256 views

Macbook power adapter issue: PPP003

I'm using Macbook Pro 15" Retina Late 2013. OS is Yosemite Public beta. Once in month I usually do diagnostics (Apple's boot time diagnostics, the when you press "D" ). The last the when I did it, I ...
5
votes
3answers
185 views

1993 Apple Color Classic

Lets all take a long journey back about 21 years ago when apple released their color classic. It was pretty awesome right? Well I managed to get my hands on one but I have some sad news. When I go to ...
0
votes
1answer
33 views

Charger problem for Phone purchased in US

I purchased Iphone 6 in US, and would be coming back to India. Which charger I should use here in India, as I know that there is a voltage difference in US and in India.
4
votes
5answers
2k views

No Batteries Available ?-How to Check battery health on MacBook Pro early 2011

A few days ago, I went on vacation and unplugged power cable from my MacBook Pro 13' early 2011 and then I got back home, the battery was not detected by OS and didn't charge. I then understood that I ...
21
votes
9answers
31k views

Is it OK to charge my iPhone with my iPad charger?

I have an iPhone 4 and an iPad. Since the iPad really charges best off the wall charger I keep it plugged in, but I usually just charge the iPhone off the computer. Although frequently if the iPad ...
8
votes
4answers
10k views

What is the iPhone's standby policy regarding WiFi and 3G?

I have an iPhone 4s with the latest iOS. It seems that when I wake it up from standby, it switches from 3G (or EDGE) to WiFi. Judging from that, I suspect it turns off WiFi when in standby, and only ...
2
votes
3answers
6k views

Retina macbook max USB power output

Could someone tell me how much Ampere the retina macbook pro can deliver over usb. I thought that one should be able to charge an ipad with a retina macbook which would mean, that it should be about ...
2
votes
1answer
109 views

Customize external HDD spindown timeout?

It's possible to enable spinning down of mechanical hard drives using the "Put hard disks to sleep when possible" option in Energy Saver, and it's possible to customize the timeout period with sudo ...
0
votes
1answer
2k views

iPod 5 charger isn't working! What do I do?

I have A ipod 5. Every time I go to charge it with a dynex or apple charger it doesn't charge. The bar stays red for over an hour. I'm thinking that I have a short in my charger. I don't know what to ...
5
votes
1answer
161 views

What unit does the activity monitor use in the energy tab?

The activity monitor of OS X show in the energy tab the energy impact. What unit does this value use? Is it Watts? If so, 327 seems a bit high for my taste. I am running this on the low end 21" late ...
1
vote
1answer
68 views

Getting a < 75 Watt charger for a macbook pro due to flight constraints

My MacBook Pro with Retina display (Mid 2012) charger has a rating of 85 Watts. I want to use it on a flight from Sydney to Los Angeles. (24 hours). (Airbus A380-800). You can plug in an AC ...
16
votes
3answers
11k views

Why does GPS on the iPhone use so much power?

I keep reading in articles that GPS on the iPhone, or any cell phone for that matter, uses a lot of power, but I've never heard an explanation of why. Why is this? The phone doesn't have to transmit ...
1
vote
1answer
47 views

Turn on MacBook with eject key or via USB

I had a problem with my MacBook Pro keyboard (mid 2010), and the power button stops working. Now, to turn on my MacBook I have to short the power pads. In the new MacBooks with no optical drive, the ...
0
votes
1answer
53 views

MacBook Pro - Only runs while MagSafe charger connected

My 2013 MacBook Pro only runs while the MagSafe power charger is connected. Model Number: A1425 (EMC 2672) When the charger is disconnected system immediately powers off (no shutdown). MagSafe ...
-1
votes
1answer
26 views

Macbook battery problem

I have a MacBook 13" (A1181) running Mac OS X 10.6.8, I have a problem with the battery When its turned off it responds to power button only when charger plugged in. After starting i can remove the ...
1
vote
1answer
82 views

Macbook Pro (Mid 2010) replacement power supply issue

I have a multi macbook/macbook pro household, made up of a 2006 mb, mid 2008 mbp, and mid2010 mbp models. I recently purchased a new 85 watt power supply and immediately noticed that it would not ...
12
votes
6answers
17k views

What would happen if I use a Macbook Air Powersupply with a 15" MacBook Pro Retina (or vice versa)

My girlfriend has a Macbook Air. The power supply is smaller and lighter than the Pro. It has an output of 14.85V and 3.05Amps. My Pro Retina has a power supply that is 20V and 4.25 Amps. Both ...
5
votes
2answers
12k views

How do you check how much current a Mac USB port can deliver?

This question is similar to the superuser question "How to check how much power a USB port can deliver", which is answered for Linux and Windows. How do you check the same on a Mac?
1
vote
1answer
16k views

How to change power savings settings on iPad 2, iOS 4.3.3

After a few minutes, if I haven't touched the iPad 2's screen, it goes dim and then turns off. I suppose this is a power savings behavior; however, when it is connected to my computer I don't want it ...
1
vote
1answer
24 views

Display toggle on/off

Sleep mode seems to cause problems with my MacPro. Is there a way to turn the monitor off and on? In "System preferences/Display/options" I can select "Display Power Button" "turns the display on ...
1
vote
1answer
67 views

What power class does an iPad and an iPhone have?

I am doing antenna simulations in order to visualize the electric field produced by an iPhone and an iPad. In order to do so, I need to know what typical power output these devices have. From ...
0
votes
2answers
15k views

iPad screen is black and won't turn on after charging and resetting

Yesterday I dropped my iPad 3 but luckily the screen did not crack. However the screen is now black and will not turn on. I can still here sounds from the iPad. How can I fix this? What I tried: ...
0
votes
2answers
228 views

Is there a way to prevent a Macbook Air from sleeping when external monitor is plugged in but power is not?

I have a 13-inch Mid 2012 Macbook Air running 10.9.3. I usually run with the lid closed plugging into 2 Apple cinema displays. Everything works great, except when I accidentally bump the power cable, ...
1
vote
1answer
22 views

Is it safe to use the mac's cable for an airport express?

When you pull the power plug off the airport express, a connector appears, similar to the connector on the mac's power brick. These connect perfectly, but I want to be sure: is it safe to use a mac's ...
0
votes
0answers
63 views

iMac shutting down when trying to install downloaded updates from Apple

My iMac keeps shutting down when I try to install the downloaded updates. It gets to "optimizing" level and shuts down.
0
votes
2answers
272 views

How to charge the MacBook Pro from 12 Volts?

Aim: I would like to charge my MacBook Pro (MBP) form a 12V lead-acid battery. However there are no official chargers from Apple for that purpose. There exist quite some alternative products on the ...
1
vote
1answer
284 views

How to limit cpu frequency in OS X?

The OS X kernel does control this directly since below 5% my CPU gets locked to 1.2GHz instead of the normal 3.7GHz so there has to be a way to control the CPU speed. I am aware of this question ...
0
votes
2answers
90 views

MacBook Pro Hibernates Straight Away

Whenever my Mac goes to sleep when its on battery, it straight away saves its contents to the hard drive and powers off, going into a deep sleep. This gets really annoying when I walk away for 10 ...
2
votes
1answer
146 views

Prevent iPhone from charging when plugged into a battery powered MacBook Air

I would like to prevent my iPhone draining power from my MacBook Air while the laptop is not plugged in and relying on battery power. How would I do this? Note, there doesn't seem to be any "unpowered ...
1
vote
1answer
181 views

A1208 2006 Intel iMac Power Supply “Power Good” voltage?

This might be a bit specific, but I am trying to test a trashed A1208 Intel iMac (Late 2006 17" Model). The power supply is dead (Fuse was blown, bypassed with a wire and bang poof a resistor and ic ...
5
votes
2answers
5k views

Monitoring power consumption on Mac

The Android OS monitors the power consumption of running apps and hardware (display). As you may guess, this is a useful feature as it allows to track down energy greedy apps. Is there an application ...
1
vote
1answer
51 views

using Apple products abroad: just replace the plug?

For many Apple products, e.g. macbook air, or iphone, the power supply is the same for different countries, and it accepts a power range of 100-240V and 50-60Hz (which I think is a great idea, since ...
10
votes
2answers
622 views

How does Apple calculate the energy consumption of a process in OS X Mavericks

In OS X Mavericks you can monitor the energy consumption of different processes in the "Activity Monitor"-App. Also there will be a menu bar icon which lists the most energy consuming applications ...
2
votes
0answers
65 views

Earthed (Grounded) Stubby Plug for MacBook AC Adapter

Much hay has been made of the apparent grounding issue while using the stubby plug on a MacBook AC adapter. While I understand it is completely safe to have a bit of grounding flowing through the ...
2
votes
6answers
11k views

Best replacement for MacBook Air MagSafe 2 cable (OEM or 3rd party?)

My MagSafe 2 cable for my 2012 MacBook Air stopped working. Took it into Apple store where I had bought my MacBook Air, and sure enough it was the excessive cat chew marks that had degraded it*. Can ...
6
votes
3answers
16k views

Does closing the lid put a MacBook Pro to sleep? Would it hurt the computer if I carry it around without shutting it down?

When I first got my MacBook Pro, it took less than 30 seconds to start up. Now, after several months, it takes about two minutes to startup and I can tell that it is not as responsive when using some ...
1
vote
1answer
246 views

MacBook Pro Battery Problems

I have a MacBook Pro late-2012 model. And my cable started showing symptoms of fraying. So I ordered an offbrand cable from Amazon with good reviews and it arrived today and I tried it and the Mac ...