A fully charged cell phone plugged into the wall is consuming about 2. Even worse is a charged laptop that's still plugged in, which consumes If you left it plugged in all year, it would consume as much electricity as running your coffeemaker for 12 days straight. Now are you wondering whether or not you should work with it plugged in? That's a whole other question, and a surprisingly complicated one. The short answer is that plugged in is probably better, but there's a full discussion here.
Leaving an empty charger plugged in has a similar effect. Clasp your hands around one that's been plugged in for a while. Feel the heat? That's wasted electricity—technically, it's called "no load mode," but in reality it's just another vampire.
According to the Berkeley Lab's testing, cell phone chargers in no load mode consume around 0. These numbers by themselves constitute a trickle, but when multiplied by the dozens of idle or "off" devices in millions of American households, these sneaky energy vampires are responsible for an estimated 10 percent of residential energy use. Vampire energy in annual energy use and cost. Image: GOOD. Fortunately, energy vampires are easier to defeat than the mythological sort. All you have to do is unplug your empty chargers, after all.
Some have little LEDs on them, so they are clearly on, munching on power. Power that costs money, and the generation of which harms the planet we all share. Rather than guess, I decided to break out my test gear and do some testing. My test meter of choice for this test is the WattsUp?
PRO power meter, as I can use this to measure how much power a device is drawing. While mine is a dedicated test meter, you can pick up domestic power meters from most online and brick-and-mortar electrical retailers these days. Power is priced in kilowatt hours KW h, or 1,W , which is 3. A device rated at 1,W running for one hour will use 1KW h, while a device rated at W will take 10 hours to consume 1KW h.
I then took a genuine Apple iPhone a 5W charger that comes with with the iPhone 11 charger and let it sip power with nothing attached to it over the course of a few days.
According to my tests, a genuine Apple iPhone charger uses in the region of W of power a month, which equates to just over 1. If I decided this was too much and moved to Louisiana, I'd save a quarter. Take this iPad example Requires a charger which is capable of supplying 2. Failure to supply this amount of current at the right voltage will extend the amount of time required to charge the iPad battery. This detrimental effect can be easily demonstrated by charging an iPad, from empty to full, with an iPhone charger.
How much charge does my device need? The graph below highlights the watt range of the common mobile devices. Why do Amps matter? Example: If a product requires 2.
Current Voltage Power 0. This is much slower than charging from the mains. Supports BC1. Some smartphones can also use a 2A charger e. Samsung Galaxy Note II. Choose a USB charger that delivers power with control Cambrionix industrial USB hubs auto-detect attached devices and automatically adjust the current output to the highest level permitted by the device manufacturer and USB specifications.
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